icinga2/doc/6.07-check-result-freshness.md

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## <a id="check-result-freshness"></a> Check Result Freshness
In Icinga 2 active check freshness is enabled by default. It is determined by the
`check_interval` attribute and no incoming check results in that period of time.
threshold = last check execution time + check interval
Passive check freshness is calculated from the `check_interval` attribute if set.
threshold = last check result time + check interval
If the freshness checks are invalid, a new check is executed defined by the
`check_command` attribute.