Prepare changelog for 2.11 RC1

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@@ -6,6 +6,61 @@ documentation before switching to a new version.
 Released closed milestones can be found [here](https://github.com/Icinga/icinga2/milestones?state=closed).
 
 
+## 2.11.0 RC1 (2019-07-25)
+
+[Issue and PRs](https://github.com/Icinga/icinga2/issues?utf8=%E2%9C%93&q=milestone%3A2.11.0)
+
+### Notes
+
+**This is the first release candidate for 2.11.**
+
+Upgrading docs: https://icinga.com/docs/icinga2/snapshot/doc/16-upgrading-icinga-2/
+
+### Enhancements
+
+* Core
+  * Rewrite Network Stack (cluster, REST API) based on Boost Asio, Beast, Coroutines
+     * Technical concept: #7041
+     * Requires package updates: Boost >1.66 (either from packages.icinga.com, EPEL or backports). SLES11 & Ubuntu 14 are EOL.
+     * Require TLS 1.2 and harden default cipher list
+  * Improved Reload Handling (umbrella process, now 3 processes at runtime)
+    * Support running Icinga 2 in (Docker) containers natively in foreground
+  * Quality: Use Modern JSON for C++ library instead of YAJL (dead project)
+  * Quality: Improve handling of invalid UTF8 strings
+* API
+  * Fix crashes and problems with permission filters from recent Namespace introduction #6785 (thanks Elias Ohm) #6874 (backported to 2.10.5)
+  * Locks and stalled waits are fixed with the core rewrite in #7071
+  * schedule-downtime action supports `all_services` for host downtimes
+  * Improve storage handling for runtime created objects in the `_api` package
+* Cluster
+  * HA aware features & improvements for failover handling #2941 #7062
+  * Improve cluster config sync with staging #6716
+* Checks & Notifications
+  * Ensure that notifications during a restart are sent
+  * Immediately notify about a problem after leaving a downtime and still NOT-OK
+  * Improve reload handling and wait for features/metrics
+  * Store notification command results and sync them in HA enabled zones #6722
+* DSL/Configuration
+  * Add getenv() function
+  * Fix TimePeriod range support over midnight
+  * `concurrent_checks` in the Checker feature has no effect, use the global MaxConcurrentChecks constant instead
+* CLI
+  * Permissions: node wizard/setup, feature, api setup now run in the Icinga user context, not root
+  * `ca list` shows pending CSRs by default, `ca remove/restore` allow to delete signing requests
+* ITL
+  * Add new commands and missing attributes
+* Windows
+  * Update bundled NSClient++ to 0.5.2.39
+* Documentation
+  * Service Monitoring: How to create plugins by example, check commands and a modern version of the supported plugin API with best practices
+  * Features: Better structure on metrics, and supported features
+  * Technical Concepts: TLS Network IO, Cluster Feature HA, Cluster Config Sync
+  * Development: Rewritten for better debugging and development experience for contributors including a style guide.  Add nightly build setup instructions.
+  * Packaging: INSTALL.md was integrated into the Development chapter, being available at https://icinga.com/docs too.
+
+
+
+
 ## 2.10.5 (2019-05-23)
 
 [Issues and PRs](https://github.com/Icinga/icinga2/milestone/81?closed=1)