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# <a id="about-icinga2"></a> About Icinga 2
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2014-02-05 15:53:22 +01:00
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## <a id="what-is-icinga2"></a> What is Icinga 2?
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2014-03-30 11:52:39 +02:00
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Icinga 2 is an open source monitoring system which checks the availability of your
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network resources, notifies users of outages and generates performance data for reporting.
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2014-03-29 01:13:28 +01:00
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Scalable and extensible, Icinga 2 can monitor complex, large environments across
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multiple locations.
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2014-02-05 15:53:22 +01:00
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## <a id="licensing"></a> Licensing
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2013-09-26 14:01:29 +02:00
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Icinga 2 and the Icinga 2 documentation are licensed under the terms of the GNU
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General Public License Version 2, you will find a copy of this license in the
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LICENSE file included in the source package.
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2014-02-05 15:53:22 +01:00
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## <a id="support"></a> Support
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2013-09-26 14:01:29 +02:00
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Support for Icinga 2 is available in a number of ways. Please have a look at
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the support overview page at [https://support.icinga.org].
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2014-03-20 21:24:39 +01:00
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## <a id="contribute"></a> Contribute
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2014-03-31 12:00:10 +02:00
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There are many ways to contribute to Icinga - be it by sending patches, testing and
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reporting bugs, reviewing and updating the documentation. Every contribution
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is appreciated!
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2014-03-31 12:00:10 +02:00
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Please get in touch with the Icinga team at [https://www.icinga.org/ecosystem/].
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2014-03-20 21:24:39 +01:00
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2014-02-05 15:53:22 +01:00
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## <a id="whats-new"></a> What's new
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2013-12-03 09:47:07 +01:00
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2014-03-31 17:05:45 +02:00
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### What's New in Version 0.0.9
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* new [apply](#apply) rules for assigning objects based on attribute conditions
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* inline object definitions removed in favor of [apply](#apply) rules
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* [import](#template-imports) keyword instead of `inherits` keyword for all objects
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* new [constants.conf](#constants-conf) providing `PluginDir` constant instead of `$plugindir$` macro
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* unknown attributes and duplicate objects generate a configuration error
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* improved configuration error output
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* create endpoint tables for legacy interfaces (status data, DB IDO, Livestatus)
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* export host `check` attribute in legacy interfaces (status data, DB IDO, Livestatus)
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* add documentation about [cluster scenarios](#cluster-scenarios)
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* Livestatus: add `check_source` attribute to services table
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* Compat: Fix host service order for Classic UI
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* Remove comments when clearing acknowledgements
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* Recovery [Notifications](#objecttype-notification) require StateFilterOK
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#### Changes
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> **Note**
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>
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> Configuration updates required!
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* removed deprecated `var`/`set` identifier, use [const](#const) instead
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* [constants.conf](#constants-conf) needs to be included in [icinga2.conf](#icinga2-conf) before [ITL](#itl) inclusion
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* [import](#template-imports) instead of `inherits` (examples in [localhost.conf](#localhost-conf))
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* [apply](#apply) rules instead of inline definitions for [Service](#objecttype-service),
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[Dependency](#objecttype-dependency), [Notification](#objecttype-notitifcation),
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[ScheduledDowntime](#objecttype-scheduleddowntime) objects (examples in [localhost.conf](#localhost-conf)).
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* unknown attributes and duplicate objects generate a configuration error
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* DB IDO: schema update for 0.0.9 ([MySQL](#upgrading-mysql-db), [PostgreSQL](#upgrading-postgresql-db))
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### Archive
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Please check the `ChangeLog` file.
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