icinga2/doc/1-about.md

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# <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/.
### <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](13-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](14-upgrading-icinga-2.md#upgrading-icinga-2) to `1.13.0` required!
TODO
#### Issues
TODO