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Icinga DB is a set of components for publishing, synchronizing and visualizing
monitoring data in the Icinga ecosystem, consisting of:
* Icinga DB Web which connects to both a Redis server and a database to view and
work with most up-to-date monitoring data
* Icinga 2 with its Icinga DB feature enabled, responsible for publishing the
data to the Redis server, i.e. configuration and its runtime updates, check
results, state changes, downtimes, acknowledgements, notifications, and other
events such as flapping
* And the Icinga DB daemon, which synchronizes the data between the Redis server
and the database
