Release version 2.4.1

[icinga2] / ChangeLog

# Icinga 2.x CHANGELOG

Please check [doc/1-about.md].

## What's New

### What's New in Version 2.4.1

#### Changes

* ITL
    * Add running_kernel_use_sudo option for the running_kernel check
* Configuration
    * Add global constants: `PlatformName`. `PlatformVersion`, `PlatformKernel` and `PlatformKernelVersion`
* CLI
    * Use NodeName and ZoneName constants for 'node setup' and 'node wizard' 

#### Feature

* Feature 10622: Add by_ssh_options argument for the check_by_ssh plugin
* Feature 10693: Add running_kernel_use_sudo option for the running_kernel check
* Feature 10716: Use NodeName and ZoneName constants for 'node setup' and 'node wizard'

#### Bugfixes

* Bug 10528: Documentation example in "Access Object Attributes at Runtime" doesn't work correctly
* Bug 10615: Build fails on SLES 11 SP3 with GCC 4.8
* Bug 10632: "node wizard" does not ask user to verify SSL certificate
* Bug 10641: API setup command incorrectly overwrites existing certificates
* Bug 10643: Icinga 2 crashes when ScheduledDowntime objects are used
* Bug 10645: Documentation for schedule-downtime is missing required paremeters
* Bug 10648: lib/base/process.cpp SIGSEGV on Debian squeeze / RHEL 6
* Bug 10661: Incorrect web inject URL in documentation
* Bug 10663: Incorrect redirect for stderr in /usr/lib/icinga2/prepare-dirs
* Bug 10667: Indentation in command-plugins.conf
* Bug 10677: node wizard checks for /var/lib/icinga2/ca directory but not the files
* Bug 10690: CLI command 'repository add' doesn't work
* Bug 10692: Fix typos in the documentation
* Bug 10708: Windows setup wizard crashes when InstallDir registry key is not set
* Bug 10710: Incorrect path for icinga2 binary in development documentation
* Bug 10720: Remove --master_zone from --help because it is currently not implemented

### What's New in Version 2.4.0

#### Changes

* API
    * RESTful API with basic auth or client certificates
    * Filters, types, permissions
    * configuration package management
    * query/create/modify/delete config objects at runtime
    * status queries for global stats
    * actions (e.g. acknowledge all service problems)
    * event streams
* ITL and Plugin Check Command definitions
    * The 'running_kernel' check command was moved to the plugins-contrib section. You have to update your config to include 'plugins-contrib'
* Configuration
    * The global constants Enable* and Vars have been removed. Use the IcingaApplication object attributes instead.
* Features
    * New Graphite tree. Please check the documentation how enable the legacy schema.
    * IcingaStatusWriter feature has been deprecated and will be removed in future versions.
    * Modified attributes are not exposed as bit mask to external interfaces anymore (api related changes). External commands like CHANGE_*_MODATTR have been removed.

#### Feature

* Feature 7709: Validators should be implemented in (auto-generated) native code
* Feature 8093: Add icinga, cluster, cluster-zone check information to the ApiListener status handler
* Feature 8149: graphite writer should pass "-" in host names and "." in perf data
* Feature 8666: Allow some of the Array and Dictionary methods to be inlined by the compiler
* Feature 8688: Add embedded DB IDO version health check
* Feature 8689: Add support for current and current-1 db ido schema version
* Feature 8690: 'icinga2 console' should serialize temporary attributes (rather than just config + state)
* Feature 8738: Implement support for CLIENT_MULTI_STATEMENTS
* Feature 8741: Deprecate IcingaStatusWriter feature
* Feature 8775: Move the base command templates into libmethods
* Feature 8776: Implement support for libedit
* Feature 8791: Refactor the startup process
* Feature 8832: Implement constructor-style casts
* Feature 8842: Add support for the C++11 keyword 'override'
* Feature 8867: Use DebugHint information when reporting validation errors
* Feature 8890: Move implementation code from thpp files into separate files
* Feature 8922: Avoid unnecessary dictionary lookups
* Feature 9044: Remove the ScopeCurrent constant
* Feature 9068: Implement sandbox mode for the config parser
* Feature 9074: Basic API framework
* Feature 9076: Reflection support for the API
* Feature 9077: Implement filters for the API
* Feature 9078: Event stream support for the API
* Feature 9079: Implement status queries for the API
* Feature 9080: Add commands (actions) for the API
* Feature 9081: Add modified attribute support for the API
* Feature 9082: Runtime configuration for the API
* Feature 9083: Configuration file management for the API
* Feature 9084: Enable the ApiListener by default
* Feature 9085: Certificate-based authentication for the API
* Feature 9086: Password-based authentication for the API
* Feature 9087: Create default administrative user
* Feature 9088: API permissions
* Feature 9091: API status queries
* Feature 9093: Changelog for modified attributes
* Feature 9095: Disallow changes for certain config attributes at runtime
* Feature 9096: Dependency tracking for objects
* Feature 9098: Update modules to support adding and removing objects at runtime
* Feature 9099: Implement support for writing configuration files
* Feature 9100: Multiple sources for zone configuration tree
* Feature 9101: Commands for adding and removing objects
* Feature 9102: Support validating configuration changes
* Feature 9103: Staging for configuration validation
* Feature 9104: Implement config file management commands
* Feature 9105: API Documentation
* Feature 9175: Move 'running_kernel' check command to plugins-contrib 'operating system' section
* Feature 9286: DB IDO/Livestatus: Add zone object table w/ endpoint members
* Feature 9414: "-Wno-deprecated-register" compiler option breaks builds on SLES 11
* Feature 9447: Implement support for HTTP
* Feature 9448: Define RESTful url schema
* Feature 9461: New Graphite schema
* Feature 9470: Implement URL parser
* Feature 9471: Implement ApiUser type
* Feature 9594: Implement base64 de- and encoder
* Feature 9614: Register ServiceOK, ServiceWarning, HostUp, etc. as constants
* Feature 9647: Move url to /lib/remote from /lib/base
* Feature 9689: Add exceptions for Utility::MkDir{,P}
* Feature 9693: Add Array::FromVector() method
* Feature 9698: Implement support for X-HTTP-Method-Override
* Feature 9704: String::Trim() should return a new string rather than modifying the current string
* Feature 9705: Add real path sanity checks to provided file paths
* Feature 9723: Documentation for config management API
* Feature 9768: Update the url parsers behaviour
* Feature 9777: Make Comments and Downtime types available as ConfigObject type in the API
* Feature 9794: Setting global variables with i2tcl doesn't work
* Feature 9849: Validation for modified attributes
* Feature 9850: Re-implement events for attribute changes
* Feature 9851: Remove GetModifiedAttributes/SetModifiedAttributes
* Feature 9852: Implement support for . in modify_attribute
* Feature 9859: Implement global modified attributes
* Feature 9866: Implement support for attaching GDB to the Icinga process on crash
* Feature 9914: Rename DynamicObject/DynamicType to ConfigObject/ConfigType
* Feature 9919: Allow comments when parsing JSON
* Feature 9921: Implement the 'base' field for the Type class
* Feature 9926: Ensure that runtime config objects are persisted on disk
* Feature 9927: Figure out how to sync dynamically created objects inside the cluster
* Feature 9929: Add override keyword for all relevant methods
* Feature 9930: Document Object#clone
* Feature 9931: Implement Object#clone and rename Array/Dictionary#clone to shallow_clone
* Feature 9933: Implement support for indexers in ConfigObject::RestoreAttribute
* Feature 9935: Implement support for restoring modified attributes
* Feature 9937: Add package attribute for ConfigObject and set its origin
* Feature 9940: Implement support for filter_vars
* Feature 9944: Add String::ToLower/ToUpper
* Feature 9946: Remove debug messages in HttpRequest class
* Feature 9953: Rename config/modules to config/packages
* Feature 9960: Implement ignore_on_error keyword
* Feature 10017: Use an AST node for the 'library' keyword
* Feature 10038: Add plural_name field to /v1/types
* Feature 10039: URL class improvements
* Feature 10042: Implement a demo API client: Icinga Studio
* Feature 10060: Implement joins for status queries
* Feature 10116: Add global status handler for the API
* Feature 10186: Make ConfigObject::{G,S}etField() method public
* Feature 10194: Sanitize error status codes and messages
* Feature 10202: Add documentation for api-users.conf and app.conf
* Feature 10209: Rename statusqueryhandler to objectqueryhandler
* Feature 10212: Move /v1/<type> to /v1/objects/<type>
* Feature 10243: Provide keywords to retrieve the current file name at parse time
* Feature 10257: Change object version to timestamps for diff updates on config sync
* Feature 10329: Pretty-print arrays and dictionaries when converting them to strings
* Feature 10368: Document that modified attributes require accept_config for cluster/clients
* Feature 10374: Add check command nginx_status
* Feature 10383: DB IDO should provide its connected state via /v1/status
* Feature 10385: Add 'support' tracker to changelog.py
* Feature 10387: Use the API for "icinga2 console"
* Feature 10388: Log a warning message on unauthorized http request
* Feature 10392: Original attributes list in IDO
* Feature 10393: Hide internal attributes
* Feature 10394: Add getter for endpoint 'connected' attribute
* Feature 10407: Remove api.cpp, api.hpp
* Feature 10409: Add documentation for apply+for in the language reference chapter
* Feature 10423: Ability to set port on SNMP Checks
* Feature 10431: Add the name for comments/downtimes next to legacy_id to DB IDO
* Feature 10441: Rewrite man page
* Feature 10479: Use ZoneName variable for parent_zone in node update-config
* Feature 10482: Documentation: Reorganize Livestatus and alternative frontends
* Feature 10503: Missing parameters for check jmx4perl
* Feature 10507: Add check command negate
* Feature 10509: Change GetLastStateUp/Down to host attributes
* Feature 10511: Add check command mysql
* Feature 10513: Add ipv4/ipv6 only to tcp and http CheckCommand
* Feature 10522: Change output format for 'icinga2 console'
* Feature 10547: Icinga 2 script debugger
* Feature 10548: Implement CSRF protection for the API
* Feature 10549: Change 'api setup' into a manual step while configuring the API
* Feature 10551: Change object query result set
* Feature 10566: Enhance programmatic examples for the API docs
* Feature 10574: Mention wxWidget (optional) requirement in INSTALL.md
* Feature 10575: Documentation for /v1/console
* Feature 10576: Explain variable names for joined objects in filter expressions
* Feature 10577: Documentation for the script debugger
* Feature 10591: Explain DELETE for config stages/packages
* Feature 10630: Update wxWidgets documentation for Icinga Studio

#### Bugfixes

* Bug 8822: Update OpenSSL for the Windows builds
* Bug 8823: Don't allow users to instantiate the StreamLogger class
* Bug 8830: Make default notifications include users from host.vars.notification.mail.users
* Bug 8865: Failed assertion in IdoMysqlConnection::FieldToEscapedString
* Bug 8907: Validation fails even though field is not required
* Bug 8924: Specify pidfile for status_of_proc in the init script
* Bug 8952: Crash in VMOps::FunctionCall
* Bug 8989: pgsql driver does not have latest mysql changes synced
* Bug 9015: Compiler warnings with latest HEAD 5ac5f98
* Bug 9027: PostgreSQL schema sets default timestamps w/o time zone
* Bug 9053: icinga demo module can not be built
* Bug 9188: Remove incorrect 'ignore where' expression from 'ssh' apply example
* Bug 9455: Fix incorrect datatype for the check_source column in icinga_statehistory table
* Bug 9547: Wrong vars changed handler in api events
* Bug 9576: Overflow in freshness_threshold column (smallint) w/ DB IDO MySQL
* Bug 9590: 'node wizard/setup' should always generate new CN certificates
* Bug 9703: Problem with child nodes in http url registry
* Bug 9735: Broken cluster config sync w/o include_zones
* Bug 9778: Accessing field ID 0 ("prototype") fails
* Bug 9793: Operator - should not work with "" and numbers
* Bug 9795: ScriptFrame's 'Self' attribute gets corrupted when an expression throws an exception
* Bug 9813: win32 build: S_ISDIR is undefined
* Bug 9843: console autocompletion should take into account parent classes' prototypes
* Bug 9868: Crash in ScriptFrame::~ScriptFrame
* Bug 9872: Color codes in console prompt break line editing
* Bug 9876: Crash during cluster log replay
* Bug 9879: Missing conf.d or zones.d cause parse failure
* Bug 9911: Do not let API users create objects with invalid names
* Bug 9966: Fix formatting in mkclass
* Bug 9968: Implement support for '.' when persisting modified attributes
* Bug 9987: Crash in ConfigCompiler::RegisterZoneDir
* Bug 10008: Don't parse config files for branches not taken
* Bug 10012: Unused variable 'dobj' in configobject.tcpp
* Bug 10024: HTTP keep-alive does not work with .NET WebClient
* Bug 10027: Filtering by name doesn't work
* Bug 10034: Unused variable console_type in consolecommand.cpp
* Bug 10041: build failure: demo module
* Bug 10048: Error handling in HttpClient/icinga-studio
* Bug 10110: Add object_id where clause for icinga_downtimehistory
* Bug 10180: API actions do not follow REST guidelines
* Bug 10198: Detect infinite recursion in user scripts
* Bug 10210: Move the Collection status handler to /v1/status
* Bug 10211: PerfdataValue is not properly serialised in status queries
* Bug 10224: URL parser is cutting off last character
* Bug 10234: ASCII NULs don't work in string values
* Bug 10238: Use a temporary file for modified-attributes.conf updates
* Bug 10241: Properly encode URLs in Icinga Studio
* Bug 10249: Config Sync shouldn't send updates for objects the client doesn't have access to
* Bug 10253: /v1/objects/<type> returns an HTTP error when there are no objects of that type
* Bug 10255: Config sync does not set endpoint syncing and plays disconnect-sync ping-pong
* Bug 10256: ConfigWriter::EmitValue should format floating point values properly
* Bug 10326: icinga2 repository host add does not work
* Bug 10350: Remove duplicated text in section "Apply Notifications to Hosts and Services"
* Bug 10355: Version updates are not working properly
* Bug 10360: Icinga2 API performance regression
* Bug 10371: Ensure that modified attributes work with clients with local config and no zone attribute
* Bug 10386: restore_attribute does not work in clusters
* Bug 10403: Escaping $ not documented
* Bug 10406: Misleading wording in generated zones.conf
* Bug 10410: OpenBSD: hang during ConfigItem::ActivateItems() in daemon startup
* Bug 10417: 'which' isn't available in a minimal CentOS container
* Bug 10422: Changing a group's attributes causes duplicate rows in the icinga_*group_members table
* Bug 10433: 'dig_lookup' custom attribute for the 'dig' check command isn't optional
* Bug 10436: Custom variables aren't removed from the IDO database
* Bug 10439: "Command options" is empty when executing icinga2 without any argument.
* Bug 10440: Improve --help output for the --log-level option
* Bug 10455: Improve error handling during log replay
* Bug 10456: Incorrect attribute name in the documentation
* Bug 10457: Don't allow scripts to access FANoUserView attributes in sandbox mode
* Bug 10461: Line continuation is broken in 'icinga2 console'
* Bug 10466: Crash in IndexerExpression::GetReference when attempting to set an attribute on an object other than the current one
* Bug 10473: IDO tries to execute empty UPDATE queries
* Bug 10491: Unique constraint violation with multiple comment inserts in DB IDO
* Bug 10495: Incorrect JSON-RPC message causes Icinga 2 to crash
* Bug 10498: IcingaStudio: Accessing non-ConfigObjects causes ugly exception
* Bug 10501: Plural name rule not treating edge case correcly
* Bug 10504: Increase the default timeout for OS checks
* Bug 10508: Figure out whether we need the Checkable attributes state_raw, last_state_raw, hard_state_raw
* Bug 10510: CreatePipeOverlapped is not thread-safe
* Bug 10512: Mismatch on {comment,downtime}_id vs internal name in the API
* Bug 10517: Circular reference between *Connection and TlsStream objects
* Bug 10518: Crash in ConfigWriter::GetKeywords
* Bug 10527: Fix indentation for Dictionary::ToString
* Bug 10529: Change session_token to integer timestamp
* Bug 10535: Spaces do not work in command arguments
* Bug 10538: Crash in ConfigWriter::EmitIdentifier
* Bug 10539: Don't validate custom attributes that aren't strings
* Bug 10540: Async mysql queries aren't logged in the debug log
* Bug 10545: Broken build - unresolved external symbol "public: void __thiscall icinga::ApiClient::ExecuteScript...
* Bug 10555: Don't try to use --gc-sections on Solaris
* Bug 10556: Update OpenSSL for the Windows builds
* Bug 10558: There's a variable called 'string' in filter expressions
* Bug 10559: Autocompletion doesn't work in the debugger
* Bug 10560: 'api setup' should create a user even when api feature is already enabled
* Bug 10561: 'remove-comment' action does not support filters
* Bug 10562: Documentation should not reference real host names
* Bug 10563: /v1/console should only use a single permission
* Bug 10568: Improve location information for errors in API filters
* Bug 10569: Icinga 2 API Docs
* Bug 10578: API call doesn't fail when trying to use a template that doesn't exist
* Bug 10580: Detailed error message is missing when object creation via API fails
* Bug 10583: modify_attribute: object cannot be cloned
* Bug 10588: Documentation for /v1/types
* Bug 10596: Deadlock in MacroProcessor::EvaluateFunction
* Bug 10601: Don't allow users to set state attributes via PUT
* Bug 10602: API overwrites (and then deletes) config file when trying to create an object that already exists
* Bug 10604: Group memberships are not updated for runtime created objects
* Bug 10629: Download URL for NSClient++ is incorrect
* Bug 10637: Utility::FormatErrorNumber fails when error message uses arguments

### What's New in Version 2.3.11

#### Changes

* Function for performing CIDR matches: cidr_match()
* New methods: String#reverse and Array#reverse
* New ITL command definitions: nwc_health, hpasm, squid, pgsql
* Additional arguments for ITL command definitions: by_ssh, dig, pop, spop, imap, simap
* Documentation updates
* Various bugfixes

#### Features

* Feature 9183: Add timestamp support for OpenTsdbWriter
* Feature 9466: Add FreeBSD setup to getting started
* Feature 9812: add check command for check_nwc_health
* Feature 9854: check_command for plugin check_hpasm
* Feature 10004: escape_shell_arg() method
* Feature 10006: Implement a way for users to resolve commands+arguments in the same way Icinga does
* Feature 10057: Command Execution Bridge: Use of same endpoint names in examples for a better understanding
* Feature 10109: Add check command squid
* Feature 10112: Add check command pgsql
* Feature 10129: Add ipv4/ipv6 only to nrpe CheckCommand
* Feature 10139: expand check command dig
* Feature 10142: Update debug docs for core dumps and full backtraces
* Feature 10157: Update graphing section in the docs
* Feature 10158: Make check_disk.exe CheckCommand Config more verbose
* Feature 10161: Improve documentation for check_memory
* Feature 10197: Implement the Array#reverse and String#reverse methods
* Feature 10207: Find a better description for cluster communication requirements
* Feature 10216: Clarify on cluster/client naming convention and add troubleshooting section
* Feature 10219: Add timeout argument for pop, spop, imap, simap commands
* Feature 10352: Improve timeperiod documentation
* Feature 10354: New method: cidr_match()
* Feature 10379: Add a debug log message for updating the program status table in DB IDO

#### Bugfixes

* Bug 8805: check cluster-zone returns wrong log lag
* Bug 9322: sending multiple Livestatus commands rejects all except the first
* Bug 10002: Deadlock in WorkQueue::Enqueue
* Bug 10079: Improve error message for socket errors in Livestatus
* Bug 10093: Rather use unique SID when granting rights for folders in NSIS on Windows Client
* Bug 10177: Windows Check Update -> Access denied
* Bug 10191: String methods cannot be invoked on an empty string
* Bug 10192: null + null should not be ""
* Bug 10199: Remove unnecessary MakeLiteral calls in SetExpression::DoEvaluate
* Bug 10204: Config parser problem with parenthesis and newlines
* Bug 10205: config checker reports wrong error on apply for rules
* Bug 10235: Deadlock in TlsStream::Close
* Bug 10239: Don't throw an exception when replaying the current replay log file
* Bug 10245: Percent character whitespace on Windows
* Bug 10254: Performance Data Labels including '=' will not be displayed correct
* Bug 10262: Don't log messages we've already relayed to all relevant zones
* Bug 10266: "Not after" value overflows in X509 certificates on RHEL5
* Bug 10348: Checkresultreader is unable to process host checks
* Bug 10349: Missing Start call for base class in CheckResultReader
* Bug 10351: Broken table layout in chapter 20
* Bug 10365: ApiListener::SyncRelayMessage doesn't send message to all zone members
* Bug 10377: Wrong connection log message for global zones

### What's New in Version 2.3.10

#### Features

* Feature 9218: Use the command_endpoint name as check_source value if defined

#### Bugfixes

* Bug 9244: String escape problem with PostgreSQL >= 9.1 and standard_conforming_strings=on
* Bug 10003: Nested "outer" macro calls fails on (handled) missing "inner" values
* Bug 10051: Missing fix for reload on Windows in 2.3.9
* Bug 10058: Wrong calculation for host compat state "UNREACHABLE" in DB IDO
* Bug 10074: Missing zero padding for generated CA serial.txt

### What's New in Version 2.3.9

#### Changes

* Fix that the first SOFT state is recognized as second SOFT state
* Implemented reload functionality for Windows
* New ITL check commands
* Documentation updates
* Various other bugfixes

#### Features

* Feature 9527: CheckCommand for check_interfaces
* Feature 9671: Add check_yum to ITL
* Feature 9675: Add check_redis to ITL
* Feature 9686: Update gdb pretty printer docs w/ Python 3
* Feature 9699: Adding "-r" parameter to the check_load command for dividing the load averages by the number of CPUs.
* Feature 9747: check_command for plugin check_clamd
* Feature 9796: Implement Dictionary#get and Array#get
* Feature 9801: Add check_jmx4perl to ITL
* Feature 9811: add check command for check_mailq
* Feature 9827: snmpv3 CheckCommand section improved
* Feature 9882: Implement the Dictionary#keys method
* Feature 9883: Use an empty dictionary for the 'this' scope when executing commands with Livestatus
* Feature 9985: add check command nscp-local-counter
* Feature 9996: Add new arguments openvmtools for Open VM Tools

#### Bugfixes

* Bug 8979: Missing DEL_DOWNTIME_BY_HOST_NAME command required by Classic UI 1.x
* Bug 9262: cluster check w/ immediate parent and child zone endpoints
* Bug 9623: missing config warning on empty port in endpoints
* Bug 9769: Set correct X509 version for certificates
* Bug 9773: Add log for missing EventCommand for command_endpoints
* Bug 9779: Trying to set a field for a non-object instance fails
* Bug 9782: icinga2 node wizard don't take zone_name input
* Bug 9806: Operator + is inconsistent when used with empty and non-empty strings
* Bug 9814: Build fix for Boost 1.59
* Bug 9835: Dict initializer incorrectly re-initializes field that is set to an empty string
* Bug 9860: missing check_perfmon.exe
* Bug 9867: Agent freezes when the check returns massive output
* Bug 9884: Warning about invalid API function icinga::Hello
* Bug 9897: First SOFT state is recognized as second SOFT state
* Bug 9902: typo in docs
* Bug 9912: check_command interfaces option match_aliases has to be boolean
* Bug 9913: Default disk checks on Windows fail because check_disk doesn't support -K
* Bug 9928: Add missing category for IDO query
* Bug 9947: Serial number field is not properly initialized for CA certificates
* Bug 9961: Don't re-download NSCP for every build
* Bug 9962: Utility::Glob on Windows doesn't support wildcards in all but the last path component
* Bug 9972: Icinga2 - too many open files - Exception
* Bug 9984: fix check command nscp-local
* Bug 9992: Duplicate severity type in the documentation for SyslogLogger

### What's New in Version 2.3.8

#### Changes

* Bugfixes

#### Bugfixes

* Bug 9554: Don't allow "ignore where" for groups when there's no "assign where"
* Bug 9634: DB IDO: Do not update endpointstatus table on config updates
* Bug 9637: Wrong parameter for CheckCommand "ping-common-windows"
* Bug 9665: Escaping does not work for OpenTSDB perfdata plugin
* Bug 9666: checkcommand disk does not check free inode - check_disk

### What's New in Version 2.3.7

#### Changes

* Bugfixes

#### Features

* Feature 9610: Enhance troubleshooting ssl errors & cluster replay log

#### Bugfixes

* Bug 9406: Selective cluster reconnecting breaks client communication
* Bug 9535: Config parser ignores "ignore" in template definition
* Bug 9584: Incorrect return value for the macro() function
* Bug 9585: Wrong formatting in DB IDO extensions docs
* Bug 9586: DB IDO: endpoint* tables are cleared on reload causing constraint violations
* Bug 9621: Assertion failed in icinga::ScriptUtils::Intersection
* Bug 9622: Missing lock in ScriptUtils::Union

### What's New in Version 2.3.6

#### Changes

* Require openssl1 on sles11sp3 from Security Module repository
  * Bug in SLES 11's OpenSSL version 0.9.8j preventing verification of generated certificates.
  * Re-create these certificates with 2.3.6 linking against openssl1 (cli command or CSR auto-signing).
* ITL: Add ldap, ntp_peer, mongodb and elasticsearch CheckCommand definitions
* Bugfixes

#### Features

* Feature 6714: add pagerduty notification documentation
* Feature 9172: Add "ldap" CheckCommand for "check_ldap" plugin
* Feature 9191: Add "mongodb" CheckCommand definition
* Feature 9415: Add elasticsearch checkcommand to itl
* Feature 9416: snmpv3 CheckCommand: Add possibility to set securityLevel
* Feature 9451: Merge documentation fixes from GitHub
* Feature 9523: Add ntp_peer CheckCommand
* Feature 9562: Add new options for ntp_time CheckCommand
* Feature 9578: new options for smtp CheckCommand

#### Bugfixes

* Bug 9205: port empty when using icinga2 node wizard
* Bug 9253: Incorrect variable name in the ITL
* Bug 9303: Missing 'snmp_is_cisco' in Manubulon snmp-memory command definition
* Bug 9436: Functions can't be specified as command arguments
* Bug 9450: node setup: indent accept_config and accept_commands
* Bug 9452: Wrong file reference in README.md
* Bug 9456: Windows client w/ command_endpoint broken with $nscp_path$ and NscpPath detection
* Bug 9463: Incorrect check_ping.exe parameter in the ITL
* Bug 9476: Documentation for checks in an HA zone is wrong
* Bug 9481: Fix stability issues in the TlsStream/Stream classes
* Bug 9489: Add log message for discarded cluster events (e.g. from unauthenticated clients)
* Bug 9490: Missing openssl verify in cluster troubleshooting docs
* Bug 9513: itl/plugins-contrib.d/*.conf should point to PluginContribDir
* Bug 9522: wrong default port documentated for nrpe
* Bug 9549: Generated certificates cannot be verified w/ openssl 0.9.8j on SLES 11
* Bug 9558: mysql-devel is not available in sles11sp3
* Bug 9563: Update getting started for Debian Jessie

### What's New in Version 2.3.5

#### Changes

* NSClient++ is now bundled with the Windows setup wizard and can optionally be installed
* Windows Wizard: "include <nscp>" is set by default
* Windows Wizard: Add update mode
* Plugins: Add check_perfmon plugin for Windows
* ITL: Add CheckCommand objects for Windows plugins ("include <windows-plugins>")
* ITL: Add CheckCommand definitions for "mongodb", "iftraffic", "disk_smb"
* ITL: Add arguments to CheckCommands "dns", "ftp", "tcp", "nscp"

#### Features

* Feature 8116: Extend Windows installer with an update mode
* Feature 8180: Add documentation and CheckCommands for the windows plugins
* Feature 8809: Add check_perfmon plugin for Windows
* Feature 9115: Add SHOWALL to NSCP Checkcommand
* Feature 9130: Add 'check_drivesize' as nscp-local check command
* Feature 9145: Add arguments to "dns" CheckCommand
* Feature 9146: Add arguments to "ftp" CheckCommand
* Feature 9147: Add arguments to "tcp" CheckCommand
* Feature 9176: ITL Documentation: Add a link for passing custom attributes as command parameters
* Feature 9180: Include Windows support details in the documentation
* Feature 9185: Add timestamp support for PerfdataWriter
* Feature 9191: Add "mongodb" CheckCommand definition
* Feature 9238: Bundle NSClient++ in Windows Installer
* Feature 9254: Add 'disk_smb' Plugin CheckCommand definition
* Feature 9256: Determine NSClient++ installation path using MsiGetComponentPath
* Feature 9260: Include <nscp> by default on Windows
* Feature 9261: Add the --load-all and --log options for nscp-local
* Feature 9263: Add support for installing NSClient++ in the Icinga 2 Windows wizard
* Feature 9270: Update service apply for documentation
* Feature 9272: Add 'iftraffic' to plugins-contrib check command definitions
* Feature 9285: Best practices: cluster config sync
* Feature 9297: Add examples for function usage in "set_if" and "command" attributes
* Feature 9310: Add typeof in 'assign/ignore where' expression as example
* Feature 9311: Add local variable scope for *Command to documentation (host, service, etc)
* Feature 9313: Use a more simple example for passing command parameters
* Feature 9318: Explain string concatenation in objects by real-world example
* Feature 9363: Update documentation for escape sequences
* Feature 9419: Enhance cluster/client troubleshooting
* Feature 9420: Enhance cluster docs with HA command_endpoints
* Feature 9431: Documentation: Move configuration before advanced topics

#### Bugfixes

* Bug 8853: Syntax Highlighting: host.address vs host.add
* Bug 8888: Icinga2 --version: Error showing Distribution
* Bug 8891: Node wont connect properly to master if host is is not set for Endpoint on new installs
* Bug 9055: Wrong timestamps w/ historical data replay in DB IDO
* Bug 9109: WIN: syslog is not an enable-able feature in windows
* Bug 9116: node update-config reports critical and warning
* Bug 9121: Possible DB deadlock
* Bug 9131: Missing ")" in last Apply Rules example
* Bug 9142: Downtimes are always "fixed"
* Bug 9143: Incorrect type and state filter mapping for User objects in DB IDO
* Bug 9161: 'disk': wrong order of threshold command arguments
* Bug 9187: SPEC: Give group write permissions for perfdata dir
* Bug 9205: port empty when using icinga2 node wizard
* Bug 9222: Missing custom attributes in backends if name is equal to object attribute
* Bug 9253: Incorrect variable name in the ITL
* Bug 9255: --scm-installs fails when the service is already installed
* Bug 9258: Some checks in the default Windows configuration fail
* Bug 9259: Disk and 'icinga' services are missing in the default Windows config
* Bug 9268: Typo in Configuration Best Practice
* Bug 9269: Wrong permission etc on windows
* Bug 9324: Multi line output not correctly handled from compat channels
* Bug 9328: Multiline vars are broken in objects.cache output
* Bug 9372: plugins-contrib.d/databases.conf: wrong argument for mssql_health
* Bug 9389: Documentation: Typo
* Bug 9390: Wrong service table attributes in Livestatus documentation
* Bug 9393: Documentation: Extend Custom Attributes with the boolean type
* Bug 9394: Including <nscp> on Linux fails with unregistered function
* Bug 9399: Documentation: Typo
* Bug 9406: Selective cluster reconnecting breaks client communication
* Bug 9412: Documentation: Update the link to register a new Icinga account

### What's New in Version 2.3.4

#### Changes

* ITL: Check commands for various databases
* Improve validation messages for time periods
* Update max_check_attempts in generic-{host,service} templates
* Update logrotate configuration
* Bugfixes

#### Features

* Feature 8760: Add database plugins to ITL
* Feature 8803: Agent Wizard: add options for API defaults
* Feature 8893: Improve timeperiod validation error messages
* Feature 8895: Add explanatory note for Icinga2 client documentation

#### Bugfixes

* Bug 8808: logrotate doesn't work on Ubuntu
* Bug 8821: command_endpoint check_results are not replicated to other endpoints in the same zone
* Bug 8879: Reword documentation of check_address
* Bug 8881: Add arguments to the UPS check
* Bug 8889: Fix a minor markdown error
* Bug 8892: Validation errors for time ranges which span the DST transition
* Bug 8894: Default max_check_attempts should be lower for hosts than for services
* Bug 8913: Windows Build: Flex detection
* Bug 8917: Node wizard should only accept 'y', 'n', 'Y' and 'N' as answers for boolean questions
* Bug 8919: Fix complexity class for Dictionary::Get
* Bug 8987: Fix a typo
* Bug 9012: Typo in graphite feature enable documentation
* Bug 9014: Don't update scheduleddowntime table w/ trigger_time column when only adding a downtime
* Bug 9016: Downtimes which have been triggered are not properly recorded in the database
* Bug 9017: scheduled_downtime_depth column is not reset when a downtime ends or when a downtime is being removed
* Bug 9021: Multiple log messages w/ "Attempting to send notifications for notification object"
* Bug 9041: Acknowledging problems w/ expire time does not add the expiry information to the related comment for IDO and compat
* Bug 9045: Vim syntax: Match groups before host/service/user objects
* Bug 9049: check_disk order of command arguments
* Bug 9050: web.conf is not in the RPM package
* Bug 9064: troubleshoot truncates crash reports
* Bug 9069: Documentation: set_if usage with boolean values and functions
* Bug 9073: custom attributes with recursive macro function calls causing sigabrt

### What's New in Version 2.3.3

#### Changes

* New function: parse_performance_data
* Include more details in --version
* Improve documentation
* Bugfixes

#### Features

* Feature 8685: Show state/type filter names in notice/debug log
* Feature 8686: Update documentation for "apply for" rules
* Feature 8693: New function: parse_performance_data
* Feature 8740: Add "access objects at runtime" examples to advanced section
* Feature 8761: Include more details in --version
* Feature 8816: Add "random" CheckCommand for test and demo purposes
* Feature 8827: Move release info in INSTALL.md into a separate file

#### Bugfixes

* Bug 8660: Update syntax highlighting for 2.3 features
* Bug 8677: Re-order the object types in alphabetical order
* Bug 8724: Missing config validator for command arguments 'set_if'
* Bug 8734: startup.log broken when the DB schema needs an update
* Bug 8736: Don't update custom vars for each status update
* Bug 8748: Don't ignore extraneous arguments for functions
* Bug 8749: Build warnings with CMake 3.1.3
* Bug 8750: Flex version check does not reject unsupported versions
* Bug 8753: Fix a typo in the documentation of ICINGA2_WITH_MYSQL and ICINGA2_WITH_PGSQL
* Bug 8755: Fix VIM syntax highlighting for comments
* Bug 8757: Add missing keywords in the syntax highlighting files
* Bug 8762: Plugin "check_http" is missing in Windows environments
* Bug 8763: Typo in doc library-reference
* Bug 8764: Revamp migration documentation
* Bug 8765: Explain processing logic/order of apply rules with for loops
* Bug 8766: Remove prompt to create a TicketSalt from the wizard
* Bug 8767: Typo and invalid example in the runtime macro documentation
* Bug 8769: Improve error message for invalid field access
* Bug 8770: object Notification + apply Service fails with error "...refers to service which doesn't exist"
* Bug 8771: Correct HA documentation
* Bug 8829: Figure out why command validators are not triggered
* Bug 8834: Return doesn't work inside loops
* Bug 8844: Segmentation fault when executing "icinga2 pki new-cert"
* Bug 8862: wrong 'dns_lookup' custom attribute default in command-plugins.conf
* Bug 8866: Fix incorrect perfdata templates in the documentation
* Bug 8869: Array in command arguments doesn't work

### What's New in Version 2.3.2

#### Changes

* Bugfixes

#### Bugfixes

* Bug 8721: Log message for cli commands breaks the init script

### What's New in Version 2.3.1

#### Changes

* Bugfixes

Please note that this version fixes the default thresholds for the disk check which were inadvertently broken in 2.3.0; if you're using percent-based custom thresholds you will need to add the '%' sign to your custom attributes

#### Features

* Feature 8659: Implement String#contains

#### Bugfixes

* Bug 8540: Kill signal sent only to check process, not whole process group
* Bug 8657: Missing program name in 'icinga2 --version'
* Bug 8658: Fix check_disk thresholds: make sure partitions are the last arguments
* Bug 8672: Api heartbeat message response time problem
* Bug 8673: Fix check_disk default thresholds and document the change of unit
* Bug 8679: Config validation fail because of unexpected new-line
* Bug 8680: Update documentation for DB IDO HA Run-Once
* Bug 8683: Make sure that the /var/log/icinga2/crash directory exists
* Bug 8684: Fix formatting for the GDB stacktrace
* Bug 8687: Crash in Dependency::Stop
* Bug 8691: Debian packages do not create /var/log/icinga2/crash

### What's New in Version 2.3.0

#### Changes

* Improved configuration validation
    * Unnecessary escapes are no longer permitted (e.g. \')
    * Dashes are no longer permitted in identifier names (as their semantics are ambiguous)
    * Unused values are detected (e.g. { "-M" })
    * Validation for time ranges has been improved
    * Additional validation rules for some object types (Notification and User)
* New language features
    * Implement a separate type for boolean values
    * Support for user-defined functions
    * Support for conditional statements (if/else)
    * Support for 'for' and 'while' loops
    * Support for local variables using the 'var' keyword
    * New operators: % (modulo), ^ (xor), - (unary minus) and + (unary plus)
    * Implemented prototype-based methods for most built-in types (e.g. [ 3, 2 ].sort())
    * Explicit access to local and global variables using the 'locals' and 'globals' keywords
    * Changed the order in which filters are evaluated for apply rules with 'for'
    * Make type objects accessible as global variables
    * Support for using functions in custom attributes
    * Access objects and their runtime attributes in functions (e.g. get_host(NodeName).state)
* ITL improvements
    * Additional check commands were added to the ITL
    * Additional arguments for existing check commands
* CLI improvements
    * Add the 'icinga2 console' CLI command which can be used to test expressions
    * Add the 'icinga2 troubleshoot' CLI command for collecting troubleshooting information
    * Performance improvements for the 'icinga2 node update-config' CLI command
    * Implement argument auto-completion for short options (e.g. daemon -c)
    * 'node setup' and 'node wizard' create backups for existing certificate files
* Add ignore_soft_states option for Dependency object configuration
* Fewer threads are used for socket I/O
* Flapping detection for hosts and services is disabled by default
* Added support for OpenTSDB
* New Livestatus tables: hostsbygroup, servicesbygroup, servicesbyhostgroup
* Include GDB backtrace in crash reports
* Various documentation improvements
* Solved a number of issues where cluster instances would not reconnect after intermittent connection problems
* A lot of other, minor changes

* [DB IDO schema upgrade](17-upgrading-icinga-2.md#upgrading-icinga-2) to `1.13.0` required!

#### Features

* Feature 3446: Add troubleshooting collect cli command
* Feature 6109: Don't spawn threads for network connections
* Feature 6570: Disallow side-effect-free r-value expressions in expression lists
* Feature 6697: Plugin Check Commands: add check_vmware_esx
* Feature 6857: Run CheckCommands with C locale (workaround for comma vs dot and plugin api bug)
* Feature 6858: Add some more PNP details
* Feature 6868: Disable flapping detection by default
* Feature 6923: IDO should fill program_end_time on a clean shutdown
* Feature 7136: extended Manubulon SNMP Check Plugin Command
* Feature 7209: ITL: Interfacetable
* Feature 7256: Add OpenTSDB Writer
* Feature 7292: ITL: Check_Mem.pl
* Feature 7294: ITL: ESXi-Hardware
* Feature 7326: Add parent soft states option to Dependency object configuration
* Feature 7361: Livestatus: Add GroupBy tables: hostsbygroup, servicesbygroup, servicesbyhostgroup
* Feature 7545: Please add labels in SNMP checks
* Feature 7564: Access object runtime attributes in custom vars & command arguments
* Feature 7610: Variable from for loop not usable in assign statement
* Feature 7700: Evaluate apply/object rules when the parent objects are created
* Feature 7702: Add an option that hides CLI commands
* Feature 7704: ConfigCompiler::HandleInclude* should return an AST node
* Feature 7706: ConfigCompiler::Compile* should return an AST node
* Feature 7748: Redesign how stack frames work for scripts
* Feature 7767: Rename _DEBUG to I2_DEBUG
* Feature 7774: Implement an AST Expression for T_CONST
* Feature 7778: Missing check_disk output on Windows
* Feature 7784: Implement the DISABLE_HOST_SVC_NOTIFICATIONS and ENABLE_HOST_SVC_NOTIFICATIONS commands
* Feature 7793: Don't build db_ido when both MySQL and PostgreSQL aren't enabled
* Feature 7794: Implement an option to disable building the Livestatus module
* Feature 7795: Implement an option to disable building the Demo component
* Feature 7805: Implement unit tests for the config parser
* Feature 7807: Move the cast functions into libbase
* Feature 7813: Implement the % operator
* Feature 7816: Document operator precedence
* Feature 7822: Make the config parser thread-safe
* Feature 7823: Figure out whether Number + String should implicitly convert the Number argument to a string
* Feature 7824: Implement the "if" and "else" keywords
* Feature 7873: Plugin Check Commands: Add icmp
* Feature 7879: Windows agent is missing the standard plugin check_ping
* Feature 7883: Implement official support for user-defined functions and the "for" keyword
* Feature 7901: Implement socket_path attribute for the IdoMysqlConnection class
* Feature 7910: The lexer shouldn't accept escapes for characters which don't have to be escaped
* Feature 7925: Move the config file for the ido-*sql features into the icinga2-ido-* packages
* Feature 8016: Documentation enhancement for snmp traps and passive checks.
* Feature 8019: Register type objects as global variables
* Feature 8020: Improve output of ToString for type objects
* Feature 8030: Evaluate usage of function()
* Feature 8033: Allow name changed from inside the object
* Feature 8040: Disallow calling strings as functions
* Feature 8043: Implement a boolean sub-type for the Value class
* Feature 8047: ConfigCompiler::HandleInclude should return an inline dictionary
* Feature 8060: Windows plugins should behave like their Linux cousins
* Feature 8065: Implement a way to remove dictionary keys
* Feature 8071: Implement a way to call methods on objects
* Feature 8074: Figure out how variable scopes should work
* Feature 8078: Backport i2tcl's error reporting functionality into "icinga2 console"
* Feature 8096: Document the new language features in 2.3
* Feature 8121: feature enable should use relative symlinks
* Feature 8133: Implement line-continuation for the "console" command
* Feature 8169: Implement additional methods for strings
* Feature 8172: Assignments shouldn't have a "return" value
* Feature 8195: Host/Service runtime macro downtime_depth
* Feature 8226: Make invalid log-severity option output an error instead of a warning
* Feature 8244: Implement keywords to explicitly access globals/locals
* Feature 8259: The check "hostalive" is not working with ipv6
* Feature 8269: Implement the while keyword
* Feature 8277: Add macros $host.check_source$ and $service.check_source$
* Feature 8290: Make operators &&, || behave like in JavaScript
* Feature 8291: Implement validator support for function objects
* Feature 8293: The Zone::global attribute is not documented
* Feature 8316: Extend disk checkcommand
* Feature 8322: Implement Array#join
* Feature 8371: Add path information for objects in object list
* Feature 8374: Add timestamp support for Graphite
* Feature 8386: Add documentation for cli command 'console'
* Feature 8393: Implement support for Json.encode and Json.decode
* Feature 8394: Implement continue/break keywords
* Feature 8399: Backup certificate files in 'node setup'
* Feature 8410: udp check command is missing arguments.
* Feature 8414: Add ITL check command for check_ipmi_sensor
* Feature 8429: add webinject checkcommand
* Feature 8465: Add the ability to use a CA certificate as a way of verifying hosts for CSR autosigning
* Feature 8467: introduce time dependent variable values
* Feature 8498: Snmp CheckCommand misses various options
* Feature 8515: Show slave lag for the cluster-zone check
* Feature 8522: Update Remote Client/Distributed Monitoring Documentation
* Feature 8527: Change Livestatus query log level to 'notice'
* Feature 8548: Add support for else-if
* Feature 8575: Include GDB backtrace in crash reports
* Feature 8599: Remove macro argument for IMPL_TYPE_LOOKUP
* Feature 8600: Add validator for time ranges in ScheduledDowntime objects
* Feature 8610: Support the SNI TLS extension
* Feature 8621: Add check commands for NSClient++
* Feature 8648: Document closures ('use')

#### Bugfixes

* Bug 6171: Remove name and return value for stats functions
* Bug 6959: Scheduled start time will be ignored if the host or service is already in a problem state
* Bug 7311: Invalid macro results in exception
* Bug 7542: Update validators for CustomVarObject
* Bug 7576: validate configured legacy timeperiod ranges
* Bug 7582: Variable expansion is single quoted.
* Bug 7644: Unity build doesn't work with MSVC
* Bug 7647: Avoid rebuilding libbase when the version number changes
* Bug 7731: Reminder notifications not being sent but logged every 5 secs
* Bug 7765: DB IDO: Duplicate entry icinga_{host,service}dependencies
* Bug 7800: Fix the shift/reduce conflicts in the parser
* Bug 7802: Change parameter type for include and include_recursive to T_STRING
* Bug 7808: Unterminated string literals should cause parser to return an error
* Bug 7809: Scoping rules for "for" are broken
* Bug 7810: Return values for functions are broken
* Bug 7811: The __return keyword is broken
* Bug 7812: Validate array subscripts
* Bug 7814: Set expression should check whether LHS is a null pointer
* Bug 7815: - operator doesn't work in expressions
* Bug 7826: Compiler warnings
* Bug 7830: - shouldn't be allowed in identifiers
* Bug 7871: Missing persistent_comment, notify_contact columns for acknowledgement table
* Bug 7894: Fix warnings when using CMake 3.1.0
* Bug 7895: Serialize() fails to serialize objects which don't have a registered type
* Bug 7995: Windows Agent: Missing directory "zones" in setup
* Bug 8018: Value("").IsEmpty() should return true
* Bug 8029: operator precedence for % and > is incorrect
* Bug 8041: len() overflows
* Bug 8061: Confusing error message for import
* Bug 8067: Require at least one user for notification objects (user or as member of user_groups)
* Bug 8076: icinga 2 Config Error needs to be more verbose
* Bug 8081: Location info for strings is incorrect
* Bug 8100: POSTGRES IDO: invalid syntax for integer: "true" while trying to update table icinga_hoststatus
* Bug 8111: User::ValidateFilters isn't being used
* Bug 8117: Agent checks fail when there's already a host with the same name
* Bug 8122: Config file passing validation causes segfault
* Bug 8132: Debug info for indexer is incorrect
* Bug 8136: Icinga crashes when config file name is invalid
* Bug 8164: escaped backslash in string literals
* Bug 8166: parsing include_recursive
* Bug 8173: Segfault on icinga::String::operator= when compiling configuration
* Bug 8175: Compiler warnings
* Bug 8179: Exception on missing config files
* Bug 8184: group assign fails with bad lexical cast when evaluating rules
* Bug 8185: Argument auto-completion doesn't work for short options
* Bug 8211: icinga2 node update should not write config for blacklisted zones/host
* Bug 8230: Lexer term for T_ANGLE_STRING is too aggressive
* Bug 8249: Problems using command_endpoint inside HA zone
* Bug 8257: Report missing command objects on remote agent
* Bug 8260: icinga2 node wizard: Create backups of certificates
* Bug 8289: Livestatus operator =~ is not case-insensitive
* Bug 8294: Running icinga2 command as non privilged user raises error
* Bug 8298: notify flag is ignored in ACKNOWLEDGE_*_PROBLEM commands
* Bug 8300: ApiListener::ReplayLog shouldn't hold mutex lock during call to Socket::Poll
* Bug 8307: PidPath, VarsPath, ObjectsPath and StatePath no longer read from init.conf
* Bug 8309: Crash in ScheduledDowntime::CreateNextDowntime
* Bug 8313: Incorrectly formatted timestamp in .timestamp file
* Bug 8318: Remote Clients: Add manual setup cli commands
* Bug 8323: Apply rule '' for host does not match anywhere!
* Bug 8333: Icinga2 master doesn't change check-status when "accept_commands = true" is not set at client node
* Bug 8372: Stacktrace on Endpoint not belonging to a zone or multiple zones
* Bug 8383: last_hard_state missing in StatusDataWriter
* Bug 8387: StatusDataWriter: Wrong host notification filters (broken fix in #8192)
* Bug 8388: Config sync authoritative file never created
* Bug 8389: Added downtimes must be triggered immediately if checkable is Not-OK
* Bug 8390: Agent writes CR CR LF in synchronized config files
* Bug 8397: Icinga2 config reset after package update (centos6.6)
* Bug 8425: DB IDO: Duplicate entry icinga_scheduleddowntime
* Bug 8433: Make the arguments for the stats functions const-ref
* Bug 8434: Build fails on OpenBSD
* Bug 8436: Indicate that Icinga2 is shutting down in case of a fatal error
* Bug 8438: DB IDO {host,service}checks command_line value is "Object of type 'icinga::Array'"
* Bug 8444: Don't attempt to restore program state from non-existing state file
* Bug 8452: Livestatus query on commands table with custom vars fails
* Bug 8461: Don't request heartbeat messages until after we've synced the log
* Bug 8473: Exception in WorkQueue::StatusTimerHandler
* Bug 8488: Figure out why 'node update-config' becomes slow over time
* Bug 8493: Misleading ApiListener connection log messages on a master (Endpoint vs Zone)
* Bug 8496: Icinga doesn't update long_output in DB
* Bug 8511: Deadlock with DB IDO dump and forcing a scheduled check
* Bug 8517: Config parser fails non-deterministic on Notification missing Checkable
* Bug 8519: apply-for incorrectly converts loop var to string
* Bug 8529: livestatus limit header not working
* Bug 8535: Crash in ApiEvents::RepositoryTimerHandler
* Bug 8536: Valgrind warning for ExternalCommandListener::CommandPipeThread
* Bug 8537: Crash in DbObject::SendStatusUpdate
* Bug 8544: Hosts: process_performance_data = 0 in database even though enable_perfdata = 1 in config
* Bug 8555: Don't accept config updates for zones for which we have an authoritative copy of the config
* Bug 8559: check_memory tool shows incorrect memory size on windows
* Bug 8593: Memory leak in Expression::GetReference
* Bug 8594: Improve Livestatus query performance
* Bug 8596: Dependency: Validate *_{host,service}_name objects on their existance
* Bug 8604: Attribute hints don't work for nested attributes
* Bug 8627: Icinga2 shuts down when service is reloaded
* Bug 8638: Fix a typo in documentation

### What's New in Version 2.2.4

#### Changes

* Bugfixes

#### Bugfixes

* Bug #6943: Configured recurring downtimes not applied on saturdays
* Bug #7660: livestatus / nsca / etc submits are ignored during reload
* Bug #7685: kUn-Bashify mail-{host,service}-notification.sh
* Bug #8128: Icinga 2.2.2 build fails on SLES11SP3 because of changed boost dependency
* Bug #8131: vfork() hangs on OS X
* Bug #8162: Satellite doesn't use manually supplied 'local zone name'
* Bug #8192: Feature statusdata shows wrong host notification options
* Bug #8201: Update Icinga Web 2 uri to /icingaweb2
* Bug #8214: Fix YAJL detection on Debian squeeze
* Bug #8222: inconsistent URL http(s)://www.icinga.org
* Bug #8223: Typos in readme file for windows plugins
* Bug #8245: check_ssmtp command does NOT support mail_from
* Bug #8256: Restart fails after deleting a Host
* Bug #8288: Crash in DbConnection::ProgramStatusHandler
* Bug #8295: Restart of Icinga hangs
* Bug #8299: Scheduling downtime for host and all services only schedules services
* Bug #8311: Segfault in Checkable::AddNotification
* Bug #8321: enable_event_handlers attribute is missing in status.dat
* Bug #8368: Output in "node wizard" is confusing

### What's New in Version 2.2.3

#### Changes

* Bugfixes

#### Bugfixes

* Bug #8063: Volatile checks trigger invalid notifications on OK->OK state changes
* Bug #8125: Incorrect ticket shouldn't cause "node wizard" to terminate
* Bug #8126: Icinga 2.2.2 doesn't build on i586 SUSE distributions
* Bug #8143: Windows plugin check_service.exe can't find service NTDS
* Bug #8144: Arguments without values are not used on plugin exec
* Bug #8147: check_interval must be greater than 0 error on update-config
* Bug #8152: DB IDO query queue limit reached on reload
* Bug #8171: Typo in example of StatusDataWriter
* Bug #8178: Icinga 2.2.2 segfaults on FreeBSD
* Bug #8181: icinga2 node update config shows hex instead of human readable names
* Bug #8182: Segfault on update-config old empty config

### What's New in Version 2.2.2

#### Changes

* Bugfixes

#### Bugfixes

* Bug #7045: icinga2 init-script doesn't validate configuration on reload action
* Bug #7064: Missing host downtimes/comments in Livestatus
* Bug #7301: Docs: Better explaination of dependency state filters
* Bug #7314: double macros in command arguments seems to lead to exception
* Bug #7511: Feature `compatlog' should flush output buffer on every new line
* Bug #7518: update-config fails to create hosts
* Bug #7591: CPU usage at 100% when check_interval = 0 in host object definition
* Bug #7618: Repository does not support services which have a slash in their name
* Bug #7683: If a parent host goes down, the child host isn't marked as unrechable in the db ido
* Bug #7707: "node wizard" shouldn't crash when SaveCert fails
* Bug #7745: Cluster heartbeats need to be more aggressive
* Bug #7769: The unit tests still crash sometimes
* Bug #7863: execute checks locally if command_endpoint == local endpoint
* Bug #7878: Segfault on issuing node update-config
* Bug #7882: Improve error reporting when libmysqlclient or libpq are missing
* Bug #7891: CLI `icinga2 node update-config` doesn't sync configs from remote clients as expected
* Bug #7913: /usr/lib/icinga2 is not owned by a package
* Bug #7914: SUSE packages %set_permissions post statement wasn't moved to common
* Bug #7917: update_config not updating configuration
* Bug #7920: Test Classic UI config file with Apache 2.4
* Bug #7929: Apache 2.2 fails with new apache conf
* Bug #8002: typeof() seems to return null for arrays and dictionaries
* Bug #8003: SIGABRT while evaluating apply rules
* Bug #8028: typeof does not work for numbers
* Bug #8039: Livestatus: Replace unixcat with nc -U
* Bug #8048: Wrong command in documentation for installing Icinga 2 pretty printers.
* Bug #8050: exception during config check
* Bug #8051: Update host examples in Dependencies for Network Reachability documentation
* Bug #8058: DB IDO: Missing last_hard_state column update in {host,service}status tables
* Bug #8059: Unit tests fail on FreeBSD
* Bug #8066: Setting a dictionary key to null does not cause the key/value to be removed
* Bug #8070: Documentation: Add note on default notification interval in getting started notifications.conf
* Bug #8075: No option to specify timeout to check_snmp and snmp manubulon commands

### What's New in Version 2.2.1

#### Changes

* Support arrays in [command argument macros](#command-passing-parameters) #6709
    * Allows to define multiple parameters for [nrpe -a](#plugin-check-command-nrpe), [nscp -l](#plugin-check-command-nscp), [disk -p](#plugin-check-command-disk), [dns -a](#plugin-check-command-dns).
* Bugfixes

#### Features

* Feature #6709: Support for arrays in macros
* Feature #7463: Update spec file to use yajl-devel
* Feature #7739: The classicui Apache conf doesn't support Apache 2.4
* Feature #7747: Increase default timeout for NRPE checks
* Feature #7867: Document how arrays in macros work

#### Bugfixes

* Bug #7173: service icinga2 status gives wrong information when run as unprivileged user
* Bug #7602: livestatus large amount of submitting unix socket command results in broken pipes
* Bug #7613: icinga2 checkconfig should fail if group given for command files does not exist
* Bug #7671: object and template with the same name generate duplicate object error
* Bug #7708: Built-in commands shouldn't be run on the master instance in remote command execution mode
* Bug #7725: Windows wizard uses incorrect CLI command
* Bug #7726: Windows wizard is missing --zone argument
* Bug #7730: Restart Icinga - Error Restoring program state from file '/var/lib/icinga2/icinga2.state'
* Bug #7735: 2.2.0 has out-of-date icinga2 man page
* Bug #7738: Systemd rpm scripts are run in wrong package
* Bug #7740: /usr/sbin/icinga-prepare-dirs conflicts in the bin and common package
* Bug #7741: Icinga 2.2 misses the build requirement libyajl-devel for SUSE distributions
* Bug #7743: Icinga2 node add failed with unhandled exception
* Bug #7754: Incorrect error message for localhost
* Bug #7770: Objects created with node update-config can't be seen in Classic UI
* Bug #7786: Move the icinga2-prepare-dirs script elsewhere
* Bug #7806: !in operator returns incorrect result
* Bug #7828: Verify if master radio box is disabled in the Windows wizard
* Bug #7847: Wrong information in section "Linux Client Setup Wizard for Remote Monitoring"
* Bug #7862: Segfault in CA handling
* Bug #7868: Documentation: Explain how unresolved macros are handled
* Bug #7890: Wrong permission in run directory after restart
* Bug #7896: Fix Apache config in the Debian package

### What's New in Version 2.2.0

#### Changes

* DB IDO schema update to version `1.12.0`
    * schema files in `lib/db_ido_{mysql,pgsql}/schema` (source)
    * Table `programstatus`: New column `program_version`
    * Table `customvariables` and `customvariablestatus`: New column `is_json` (required for custom attribute array/dictionary support)
* New features
    * [GelfWriter](#gelfwriter): Logging check results, state changes, notifications to GELF (graylog2, logstash) #7619
    * Agent/Client/Node framework #7249
    * Windows plugins for the client/agent parts #7242 #7243
* New CLI commands #7245
    * `icinga2 feature {enable,disable}` replaces `icinga2-{enable,disable}-feature` script  #7250
    * `icinga2 object list` replaces `icinga2-list-objects` script  #7251
    * `icinga2 pki` replaces` icinga2-build-{ca,key}` scripts  #7247
    * `icinga2 repository` manages `/etc/icinga2/repository.d` which must be included in `icinga2.conf` #7255
    * `icinga2 node` cli command provides node (master, satellite, agent) setup (wizard) and management functionality #7248
    * `icinga2 daemon` for existing daemon arguments (`-c`, `-C`). Removed `-u` and `-g` parameters in favor of [init.conf](#init-conf).
    * bash auto-completion & terminal colors #7396
* Configuration
    * Former `localhost` example host is now defined in [hosts.conf](#hosts-conf) #7594
    * All example services moved into advanced apply rules in [services.conf](#services-conf)
    * Updated downtimes configuration example in [downtimes.conf](#downtimes-conf) #7472
    * Updated notification apply example in [notifications.conf](#notifications-conf) #7594
    * Support for object attribute 'zone' #7400
    * Support setting [object variables in apply rules](#dependencies-apply-custom-attributes) #7479
    * Support arrays and dictionaries in [custom attributes](#custom-attributes-apply) #6544 #7560
    * Add [apply for rules](#using-apply-for) for advanced dynamic object generation #7561
    * New attribute `accept_commands` for [ApiListener](#objecttype-apilistener) #7559
    * New [init.conf](#init-conf) file included first containing new constants `RunAsUser` and `RunAsGroup`.
* Cluster
    * Add [CSR Auto-Signing support](#csr-autosigning-requirements) using generated ticket #7244
    * Allow to [execute remote commands](#icinga2-remote-monitoring-client-command-execution) on endpoint clients #7559
* Perfdata
    * [PerfdataWriter](#writing-performance-data-files): Don't change perfdata, pass through from plugins #7268
    * [GraphiteWriter](#graphite-carbon-cache-writer): Add warn/crit/min/max perfdata and downtime_depth stats values #7366 #6946
* Packages
    * `python-icinga2` package dropped in favor of integrated cli commands #7245
    * Windows Installer for the agent parts #7243

> **Note**
>
>  Please remove `conf.d/hosts/localhost*` after verifying your updated configuration!

#### Features

* Feature #6544: Support for array in custom variable.
* Feature #6946: Add downtime depth as statistic metric for GraphiteWriter
* Feature #7187: Document how to use multiple assign/ignore statements with logical "and" & "or"
* Feature #7199: Cli commands: add filter capability to 'object list'
* Feature #7241: Windows Wizard
* Feature #7242: Windows plugins
* Feature #7243: Windows installer
* Feature #7244: CSR auto-signing
* Feature #7245: Cli commands
* Feature #7246: Cli command framework
* Feature #7247: Cli command: pki
* Feature #7248: Cli command: Node
* Feature #7249: Node Repository
* Feature #7250: Cli command: Feature
* Feature #7251: Cli command: Object
* Feature #7252: Cli command: SCM
* Feature #7253: Cli Commands: Node Repository Blacklist & Whitelist
* Feature #7254: Documentation: Agent/Satellite Setup
* Feature #7255: Cli command: Repository
* Feature #7262: macro processor needs an array printer
* Feature #7319: Documentation: Add support for locally-scoped variables for host/service in applied Dependency
* Feature #7334: GraphiteWriter: Add support for customized metric prefix names
* Feature #7356: Documentation: Cli Commands
* Feature #7366: GraphiteWriter: Add warn/crit/min/max perfdata values if existing
* Feature #7370: CLI command: variable
* Feature #7391: Add program_version column to programstatus table
* Feature #7396: Implement generic color support for terminals
* Feature #7400: Remove zone keyword and allow to use object attribute 'zone'
* Feature #7415: CLI: List disabled features in feature list too
* Feature #7421: Add -h next to --help
* Feature #7423: Cli command: Node Setup
* Feature #7452: Replace cJSON with a better JSON parser
* Feature #7465: Cli command: Node Setup Wizard (for Satellites and Agents)
* Feature #7467: Remove virtual agent name feature for localhost
* Feature #7472: Update downtimes.conf example config
* Feature #7478: Documentation: Mention 'icinga2 object list' in config validation
* Feature #7479: Set host/service variable in apply rules
* Feature #7480: Documentation: Add host/services variables in apply rules
* Feature #7504: Documentation: Revamp getting started with 1 host and multiple (service) applies
* Feature #7514: Documentation: Move troubleshooting after the getting started chapter
* Feature #7524: Documentation: Explain how to manage agent config in central repository
* Feature #7543: Documentation for arrays & dictionaries in custom attributes and their usage in apply rules for
* Feature #7559: Execute remote commands on the agent w/o local objects by passing custom attributes
* Feature #7560: Support dictionaries in custom attributes
* Feature #7561: Generate objects using apply with foreach in arrays or dictionaries (key => value)
* Feature #7566: Implement support for arbitrarily complex indexers
* Feature #7594: Revamp sample configuration: add NodeName host, move services into apply rules schema
* Feature #7596: Plugin Check Commands: disk is missing '-p', 'x' parameter
* Feature #7619: Add GelfWriter for writing log events to graylog2/logstash
* Feature #7620: Documentation: Update Icinga Web 2 installation
* Feature #7622: Icinga 2 should use less RAM
* Feature #7680: Conditionally enable MySQL and PostgresSQL, add support for FreeBSD and DragonFlyBSD

#### Bugfixes

* Bug #6547: delaying notifications with times.begin should postpone first notification into that window
* Bug #7257: default value for "disable_notifications" in service dependencies is set to "false"
* Bug #7268: Icinga2 changes perfdata order and removes maximum
* Bug #7272: icinga2 returns exponential perfdata format with check_nt
* Bug #7275: snmp-load checkcommand has wrong threshold syntax
* Bug #7276: SLES (Suse Linux Enterprise Server) 11 SP3 package dependency failure
* Bug #7302: ITL: check_procs and check_http are missing arguments
* Bug #7324: config parser crashes on unknown attribute in assign
* Bug #7327: Icinga2 docs: link supported operators from sections about apply rules
* Bug #7331: Error messages for invalid imports missing
* Bug #7338: Docs: Default command timeout is 60s not 5m
* Bug #7339: Importing a CheckCommand in a NotificationCommand results in an exception without stacktrace.
* Bug #7349: Documentation: Wrong check command for snmp-int(erface)
* Bug #7351: snmp-load checkcommand has a wrong "-T" param value
* Bug #7359: Setting snmp_v2 can cause snmp-manubulon-command derived checks to fail
* Bug #7365: Typo for "HTTP Checks" match in groups.conf
* Bug #7369: Fix reading perfdata in compat/checkresultreader
* Bug #7372: custom attribute name 'type' causes empty vars dictionary
* Bug #7373: Wrong usermod command for external command pipe setup
* Bug #7378: Commands are auto-completed when they shouldn't be
* Bug #7379: failed en/disable feature should return error
* Bug #7380: Debian package root permissions interfere with icinga2 cli commands as icinga user
* Bug #7392: Schema upgrade files are missing in /usr/share/icinga2-ido-{mysql,pgsql}
* Bug #7417: CMake warnings on OS X
* Bug #7428: Documentation: 1-about contribute links to non-existing report a bug howto
* Bug #7433: Unity build fails on RHEL 5
* Bug #7446: When replaying logs the secobj attribute is ignored
* Bug #7473: Performance data via API is broken
* Bug #7475: can't assign Service to Host in nested HostGroup
* Bug #7477: Fix typos and other small corrections in documentation
* Bug #7482: OnStateLoaded isn't called for objects which don't have any state
* Bug #7483: Hosts/services should not have themselves as parents
* Bug #7495: Utility::GetFQDN doesn't work on OS X
* Bug #7503: Icinga2 fails to start due to configuration errors
* Bug #7520: Use ScriptVariable::Get for RunAsUser/RunAsGroup
* Bug #7536: Object list dump erraneously evaluates template definitions
* Bug #7537: Nesting an object in a template causes the template to become non-abstract
* Bug #7538: There is no __name available to nested objects
* Bug #7573: link missing in documentation about livestatus
* Bug #7577: Invalid checkresult object causes Icinga 2 to crash
* Bug #7579: only notify users on recovery which have been notified before (not-ok state)
* Bug #7585: Nested templates do not work (anymore)
* Bug #7586: Exception when executing check
* Bug #7597: Compilation Error with boost 1.56 under Windows
* Bug #7599: Plugin execution on Windows does not work
* Bug #7617: mkclass crashes when called without arguments
* Bug #7623: Missing state filter 'OK' must not prevent recovery notifications being sent
* Bug #7624: Installation on Windows fails
* Bug #7625: IDO module crashes on Windows
* Bug #7646: Get rid of static boost::mutex variables
* Bug #7648: Unit tests fail to run
* Bug #7650: Wrong set of dependency state when a host depends on a service
* Bug #7681: CreateProcess fails on Windows 7
* Bug #7688: DebugInfo is missing for nested dictionaries


### What's New in Version 2.1.1

#### Features

* Feature #6719: Change log message for checking/sending notifications
* Feature #7028: Document how to use @ to escape keywords
* Feature #7033: Add include guards for mkclass files
* Feature #7034: Ensure that namespaces for INITIALIZE_ONCE and REGISTER_TYPE are truly unique
* Feature #7035: Implement support for unity builds
* Feature #7039: Figure out a better way to set the version for snapshot builds
* Feature #7040: Unity builds: Detect whether __COUNTER__ is available
* Feature #7041: Enable unity build for RPM/Debian packages
* Feature #7070: Explain event commands and their integration by a real life example (httpd restart via ssh)
* Feature #7158: Extend documentation for icinga-web on Debian systems

#### Bugfixes

* Bug #6147: Link libcJSON against libm
* Bug #6696: make test fails on openbsd
* Bug #6841: Too many queued messages
* Bug #6862: SSL_read errors during restart
* Bug #6981: SSL errors with interleaved SSL_read/write
* Bug #7029: icinga2.spec: files-attr-not-set for python-icinga2 package
* Bug #7032: "Error parsing performance data" in spite of "enable_perfdata = false"
* Bug #7036: Remove validator for the Script type
* Bug #7037: icinga2-list-objects doesn't work with Python 3
* Bug #7038: Fix rpmlint errors
* Bug #7042: icinga2-list-objects complains about Umlauts and stops output
* Bug #7044: icinga2 init-script terminates with exit code 0 if $DAEMON is not in place or not executable
* Bug #7047: service icinga2 status - prints cat error if the service is stopped
* Bug #7058: Exit code is not initialized for some failed checks
* Bug #7065: pipe2 returns ENOSYS on GNU Hurd and Debian kfreebsd
* Bug #7072: GraphiteWriter should ignore empty perfdata value
* Bug #7080: Missing differentiation between service and systemctl
* Bug #7096: new SSL Errors with too many queued messages
* Bug #7115: Build fails on Haiku
* Bug #7123: Manubulon-Plugin conf Filename wrong
* Bug #7139: GNUInstallDirs.cmake outdated
* Bug #7167: Segfault using cluster in TlsStream::IsEof
* Bug #7168: fping4 doesn't work correctly with the shipped command-plugins.conf
* Bug #7186: Livestatus hangs from time to time
* Bug #7195: fix memory leak ido_pgsql
* Bug #7210: clarify on db ido upgrades

### What's New in Version 2.1.0

#### Changes

* DB IDO schema upgrade ([MySQL](#upgrading-mysql-db),[PostgreSQL](#upgrading-postgresql-db) required!
    * new schema version: **1.11.7**
    * RPMs install the schema files into `/usr/share/icinga2-ido*` instead of `/usr/share/doc/icinga2-ido*` #6881
* [Information for config objects](#list-configuration-objects) using `icinga2-list-objects` script #6702
* Add Python 2.4 as requirement #6702
* Add search path: If `-c /etc/icinga2/icinga2.conf` is omitted, use `SysconfDir + "/icinga2/icinga2.conf"` #6874
* Change log level for failed commands #6751
* Notifications are load-balanced in a [High Availability cluster setup](#high-availability-notifications) #6203
    * New config attribute: `enable_ha`
* DB IDO "run once" or "run everywhere" mode in a [High Availability cluster setup](#high-availability-db-ido) #6203 #6827
    * New config attributes: `enable_ha` and `failover_timeout`
* RPMs use the `icingacmd` group for /var/{cache,log,run}/icinga2 #6948

#### Features

* Feature #5219: Cluster support for modified attributes
* Feature #6066: Better log messages for cluster changes
* Feature #6203: Better cluster support for notifications / IDO
* Feature #6205: Log replay sends messages to instances which shouldn't get those messages
* Feature #6702: Information for config objects
* Feature #6704: Release 2.1
* Feature #6751: Change log level for failed commands
* Feature #6874: add search path for icinga2.conf
* Feature #6898: Enhance logging for perfdata/graphitewriter
* Feature #6919: Clean up spec file
* Feature #6920: Recommend related packages on SUSE distributions
* API - Bug #6998: ApiListener ignores bind_host attribute
* DB IDO - Feature #6827: delay ido connect in ha cluster
* Documentation - Bug #6870: Wrong object attribute 'enable_flap_detection'
* Documentation - Bug #6878: Wrong parent in Load Distribution
* Documentation - Bug #6909: clarify on which config tools are available
* Documentation - Bug #6968: Update command arguments 'set_if' and beautify error message
* Documentation - Bug #6995: Keyword "required" used inconsistently for host and service "icon_image*" attributes
* Documentation - Feature #6651: Migration: note on check command timeouts
* Documentation - Feature #6703: Documentation for zones and cluster permissions
* Documentation - Feature #6743: Better explanation for HA config cluster
* Documentation - Feature #6839: Explain how the order attribute works in commands
* Documentation - Feature #6864: Add section for reserved keywords
* Documentation - Feature #6867: add section about disabling re-notifications
* Documentation - Feature #6869: Add systemd options: enable, journal
* Documentation - Feature #6922: Enhance Graphite Writer description
* Documentation - Feature #6949: Add documentation for icinga2-list-objects
* Documentation - Feature #6997: how to add a new cluster node
* Documentation - Feature #7018: add example selinux policy for external command pipe
* Plugins - Feature #6650: Plugin Check Commands: add manubulon snmp plugins

#### Bugfixes

* Bug #6881: make install does not install the db-schema
* Bug #6915: use _rundir macro for configuring the run directory
* Bug #6916: External command pipe: Too many open files
* Bug #6917: enforce /usr/lib as base for the cgi path on SUSE distributions
* Bug #6942: ExternalCommandListener fails open pipe: Too many open files
* Bug #6948: check file permissions in /var/cache/icinga2
* Bug #6962: Commands are processed multiple times
* Bug #6964: Host and service checks stuck in "pending" when hostname = localhost a parent/satellite setup
* Bug #7001: Build fails with Boost 1.56
* Bug #7016: 64-bit RPMs are not installable

### What's New in Version 2.0.2

#### Changes

* DB IDO schema upgrade required (new schema version: 1.11.6)

#### Features

* Feature #5818: SUSE packages
* Feature #6655: Build packages for el7
* Feature #6688: Rename README to README.md
* Feature #6698: Require command to be an array when the arguments attribute is used
* Feature #6700: Release 2.0.2
* Feature #6783: Print application paths for --version
* DB IDO - Bug #6414: objects and their ids are inserted twice
* DB IDO - Bug #6608: Two Custom Variables with same name, but Upper/Lowercase creating IDO duplicate entry
* DB IDO - Bug #6646: NULL vs empty string
* DB IDO - Bug #6850: exit application if ido schema version does not match
* Documentation - Bug #6652: clarify on which features are required for classic ui/web/web2
* Documentation - Bug #6708: update installation with systemd usage
* Documentation - Bug #6711: icinga Web: wrong path to command pipe
* Documentation - Bug #6725: Missing documentation about implicit dependency
* Documentation - Bug #6728: wrong path for the file 'localhost.conf'
* Migration - Bug #6558: group names quoted twice in arrays
* Migration - Bug #6560: Service dependencies aren't getting converted properly
* Migration - Bug #6561: $TOTALHOSTSERVICESWARNING$ and $TOTALHOSTSERVICESCRITICAL$ aren't getting converted
* Migration - Bug #6563: Check and retry intervals are incorrect
* Migration - Bug #6786: Fix notification definition if no host_name / service_description given
* Plugins - Feature #6695: Plugin Check Commands: Add expect option to check_http
* Plugins - Feature #6791: Plugin Check Commands: Add timeout option to check_ssh

#### Bugfixes

* Bug #6450: ipmi-sensors segfault due to stack size
* Bug #6479: Notifications not always triggered
* Bug #6501: Classic UI Debian/Ubuntu: apache 2.4 requires 'a2enmod cgi' & apacheutils installed
* Bug #6548: Add cmake constant for PluginDir
* Bug #6549: GraphiteWriter regularly sends empty lines
* Bug #6550: add log message for invalid performance data
* Bug #6589: Command pipe blocks when trying to open it more than once in parallel
* Bug #6621: Infinite loop in TlsStream::Close
* Bug #6627: Location of the run directory is hard coded and bound to "local_state_dir"
* Bug #6659: RPMLint security warning - missing-call-to-setgroups-before-setuid /usr/sbin/icinga2
* Bug #6682: Missing detailed error messages on ApiListener SSL Errors
* Bug #6686: Event Commands are triggered in OK HARD state everytime
* Bug #6687: Remove superfluous quotes and commas in dictionaries
* Bug #6713: sample config: add check commands location hint (itl/plugin check commands)
* Bug #6718: "order" attribute doesn't seem to work as expected
* Bug #6724: TLS Connections still unstable in 2.0.1
* Bug #6756: GraphiteWriter: Malformatted integer values
* Bug #6765: Config validation without filename argument fails with unhandled exception
* Bug #6768: Repo Error on RHEL 6.5
* Bug #6773: Order doesn't work in check ssh command
* Bug #6782: The "ssl" check command always sets -D
* Bug #6790: Service icinga2 reload command does not cause effect
* Bug #6809: additional group rights missing when Icinga started with -u and -g
* Bug #6810: High Availablity does not synchronise the data like expected
* Bug #6820: Icinga 2 crashes during startup
* Bug #6821: [Patch] Fix build issue and crash found on Solaris, potentially other Unix OSes
* Bug #6825: incorrect sysconfig path on sles11
* Bug #6832: Remove if(NOT DEFINED ICINGA2_SYSCONFIGFILE) in etc/initsystem/CMakeLists.txt
* Bug #6840: Missing space in error message
* Bug #6849: Error handler for getaddrinfo must use gai_strerror
* Bug #6852: Startup logfile is not flushed to disk
* Bug #6856: event command execution does not call finish handler
* Bug #6861: write startup error messages to error.log

### What's New in Version 2.0.1

#### Features

* Feature #6531: Add port option to check imap/pop/smtp and a new dig
* Feature #6581: Add more options to snmp check
* DB IDO - Bug #5577: PostgreSQL string escaping
* DB IDO - Bug #6577: icinga2-ido-pgsql snapshot package missing dependecy dbconfig-common
* Documentation - Bug #6506: Array section confusing
* Documentation - Bug #6592: Documentation for || and && is missing
* Documentation - Feature #6658: change docs.icinga.org/icinga2/latest to git master
* Livestatus - Bug #6494: Thruk Panorama View cannot query Host Status
* Livestatus - Feature #5312: OutputFormat python
* Migration - Bug #6559: $SERVICEDESC$ isn't getting converted correctly

#### Bugfixes

* Bug #6316: application fails to start on wrong log file permissions but does not tell about it
* Bug #6368: Deadlock in ApiListener::RelayMessage
* Bug #6373: base64 on CentOS 5 fails to read certificate bundles
* Bug #6388: Debian package icinga2-classicui needs versioned dependency of icinga-cgi*
* Bug #6488: build warnings
* Bug #6492: icinga2.state could not be opened
* Bug #6493: Copyright problems
* Bug #6498: icinga2 cannot be built with both systemd and init.d files
* Bug #6510: Reminder notifications are sent on disabled services
* Bug #6526: htpasswd should be installed with icinga2-classicui on Ubuntu
* Bug #6529: parsing of double defined command can generate unexpected errors
* Bug #6537: Icinga doesn't send SetLogPosition messages when one of the endpoints fails to connect
* Bug #6551: Improve systemd service definition
* Bug #6565: Dependencies should cache their parent and child object
* Bug #6574: Check command result doesn't match
* Bug #6576: Remove line number information from stack traces
* Bug #6588: Notifications causing segfault from exim
* Bug #6605: Please add --sni option to http check command
* Bug #6612: Icinga stops updating IDO after a while
* Bug #6617: TLS connections are still unstable
* Bug #6620: icinga2-build-ca shouldn't prompt for DN
* Bug #6622: icinga2-sign-key creates ".crt" and ".key" files when the CA passphrase is invalid
* Bug #6657: ICINGA2_SYSCONFIGFILE should use full path using CMAKE_INSTALL_FULL_SYSCONFDIR
* Bug #6662: Increase icinga.cmd Limit
* Bug #6665: Build fails when MySQL is not installed
* Bug #6671: enabled_notification doesn't work as expected
* Bug #6672: Icinga crashes after "Too many queued messages"
* Bug #6673: enable_notifications = false for users has no effect