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Enhance documentation regarding internal icinga config sync check (#10101) 

* Update 10-icinga-template-library.md

Explicitly name the config-sync check feature of the icinga check, as before this was a little bit too undocumented making it unknown to me.
Also mention where the check has to executed in order to bring the desired results.

* Update 15-troubleshooting.md

Add 4h typical error point for configuration stored outside of /etc/icinga2/zones.d. For when a non-distributed setup was migrated to a distributed setup.
Also link to the internal icinga CheckCommand to promote its existance.

* Update 15-troubleshooting.md

Remove "-" from link

* Revert "Update 15-troubleshooting.md"

This reverts commit bb25ba3ff5.

* Update AUTHORS

Add myself to AUTHORS

* Update doc/15-troubleshooting.md

Co-authored-by: alvar <8402811+oxzi@users.noreply.github.com>

* Update doc/10-icinga-template-library.md

Co-authored-by: alvar <8402811+oxzi@users.noreply.github.com>

* Update doc/15-troubleshooting.md

Co-authored-by: alvar <8402811+oxzi@users.noreply.github.com>

---------

Co-authored-by: alvar <8402811+oxzi@users.noreply.github.com>
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AUTHORS
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@ -52,6 +52,7 @@ Christian Gut <cycloon@is-root.org>
Christian Harke <ch.harke@gmail.com>
Christian Jonak <christian@jonak.org>
Christian Lehmann <christian_lehmann@gmx.de>
Christian Lauf <github.com@christian-lauf.info>
Christian Loos <cloos@netsandbox.de>
Christian Schmidt <github@chsc.dk>
Christopher Peterson <3893680+cspeterson@users.noreply.github.com>

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doc/10-icinga-template-library.md
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@ -75,8 +75,10 @@ plugin scripts.
### icinga <a id="itl-icinga"></a>
Check command for the built-in `icinga` check. This check returns performance
data for the current Icinga instance, reports as warning if the last reload failed and optionally allows for minimum version checks.
Check command for the built-in `icinga` check. This check returns performance data for the current Icinga instance,
reports as warning if the last reload or config sync failed and optionally allows for minimum version checks.
For the config sync check to work, it must be run on the satellite or agent.
Custom variables passed as [command parameters](03-monitoring-basics.md#command-passing-parameters):

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doc/15-troubleshooting.md
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@ -1698,6 +1698,9 @@ Typical errors are:
* The api feature doesn't [accept config](06-distributed-monitoring.md#distributed-monitoring-top-down-config-sync). This is logged into `/var/lib/icinga2/icinga2.log`.
* The received configuration zone is not configured in [zones.conf](04-configuration.md#zones-conf) and Icinga denies it. This is logged into `/var/lib/icinga2/icinga2.log`.
* The satellite/agent has local configuration in `/etc/icinga2/zones.d` and thinks it is authoritive for this zone. It then denies the received update. Purge the content from `/etc/icinga2/zones.d`, `/var/lib/icinga2/api/zones/*` and restart Icinga to fix this.
* Configuration parts stored outside of `/etc/icinga2/zones.d` on the master, for example a constant in `/etc/icinga2/constants.conf`, are then missing on the satellite/agent.
Note that if set up, the [built-in icinga CheckCommand](10-icinga-template-library.md#icinga) will notify you in case the config sync wasn't successful.
#### New configuration does not trigger a reload <a id="troubleshooting-cluster-config-sync-no-reload"></a>