# <a id="about-icinga2"></a> About Icinga 2

## <a id="what-is-icinga2"></a> What is Icinga 2?

Icinga 2 is an open source monitoring system which checks the availability of
your network resources, notifies users of outages, and generates performance
data for reporting.

Scalable and extensible, Icinga 2 can monitor large, complex environments across
multiple locations.

## <a id="licensing"></a> Licensing

Icinga 2 and the Icinga 2 documentation are licensed under the terms of the GNU
General Public License Version 2, you will find a copy of this license in the
LICENSE file included in the source package.

## <a id="support"></a> Support

Support for Icinga 2 is available in a number of ways. Please have a look at
the [support overview page](https://support.icinga.org).

## <a id="contribute"></a> Contribute

There are many ways to contribute to Icinga - whether it be sending patches,
testing, reporting bugs, or reviewing and updating the documentation. Every
contribution is appreciated!

Please get in touch with the Icinga team at https://www.icinga.org/community/.

If you want to help update this documentation please read
[this howto](https://wiki.icinga.org/display/community/Update+the+Icinga+2+documentation).

### <a id="development"></a> Icinga 2 Development

You can follow Icinga 2's development closely by checking
out these resources:

* [Development Bug Tracker](https://dev.icinga.org/projects/i2): [How to report a bug?](https://www.icinga.org/icinga/faq/)
* Git Repositories: [main mirror on icinga.org](https://git.icinga.org/?p=icinga2.git;a=summary) [release mirror at github.com](https://github.com/Icinga/icinga2)
* [Git Checkins Mailinglist](https://lists.icinga.org/mailman/listinfo/icinga-checkins)
* [Development](https://lists.icinga.org/mailman/listinfo/icinga-devel) and [Users](https://lists.icinga.org/mailman/listinfo/icinga-users) Mailinglists
* [#icinga-devel on irc.freenode.net](http://webchat.freenode.net/?channels=icinga-devel) including a Git Commit Bot

For general support questions, please refer to the [community support channels](https://support.icinga.org).

### <a id="how-to-report-bug-feature-requests"></a> How to Report a Bug or Feature Request

More details in the [Icinga FAQ](https://www.icinga.org/icinga/faq/).

* [Register](https://exchange.icinga.org/authentication/register) an Icinga account.
* Create a new issue at the [Icinga 2 Development Tracker](https://dev.icinga.org/projects/i2).
* When reporting a bug, please include the details described in the [Troubleshooting](16-troubleshooting.md#troubleshooting-information-required) chapter (version, configs, logs, etc).

## <a id="whats-new"></a> What's new

### What's New in Version 2.3

#### Changes

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

TODO

#### Issues

TODO