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 complex, large 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 at [https://support.icinga.org].
## <a id="contribute"></a> Contribute
There are many ways to contribute to Icinga - be it by sending patches, testing and
reporting bugs, reviewing and updating the documentation. Every contribution
is appreciated!
Please get in touch with the Icinga team at [https://www.icinga.org/ecosystem/].
## <a id="demo-vm"></a> Demo VM
Icinga 2 is available as [Vagrant Demo VM](#vagrant).
## <a id="whats-new"></a> What's new
### What's New in Version 0.0.11
* Redesigned cluster stack. #6192
* Support for conditional command arguments. #5933
* IDO: is_reachable attribute for hosts and services. #6094
* IDO: Add missing events for service/host state changes. #6151
* Lots of documentation updates. #6010, #6115, #6149, #6163, #6184, #6198, #6114, #6128, #5485
* Plenty of bug fixes. #6179, #6148, #6111, #6131, and many more
#### Changes
> **Note**
>
> Configuration updates required!
* Configuration Changes. For a detailed list of changes check out [#5909](https://dev.icinga.org/issues/5909)
* DB IDO schema upgrade required.
### Archive
Please check the `ChangeLog` file.