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doc: Explain icingadb built-in check

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Briefly explain what the built-in icingadb check actually checks and
what outputs one can expect. This does not contain every possible check
output, but touches the different topics the check verifies.

References Icinga/icingadb#1009.
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doc/10-icinga-template-library.md
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@ -108,6 +108,15 @@ cluster\_lag\_critical | **Optional.** Critical threshold for log lag in seconds
### icingadb <a id="itl-icinga-icingadb"></a>
Check command for the built-in `icingadb` check.
It performs multiple checks, such as verifying that:
- Whether the `IcingaDB` object has an active Redis connection.
- Whether the Icinga DB daemon is active and has recently sent a heartbeat to Redis.
- Whether exactly one Icinga DB daemon is claiming responsibility in HA mode.
- Whether Icinga 2 does not take too long dumping the configuration to Redis (_full dump_).
- Whether the Icinga DB daemon does not take too long synchronizing the configuration to the relation database (_full sync_).
- The Redis backlog does not accumulate (_redis backlog_).
- The relational database backlog does not accumulate (_database backlog_).
Custom variables passed as [command parameters](03-monitoring-basics.md#command-passing-parameters):