This check monitors the number of Kubernetes replicas.
In the event that the number of ready or up-to-date replicas is below the
number of desired replicas, the check shows a WARN and CRIT state if this
persists for more than 5 minutes and 10 minutes respectively. Moreover,
if there are misscheduled Pods controlled by a DaemonSet, then the check
will also show WARN/CRIT, after 5/10 minutes.
The check also monitors the number of replicas that are available. However, this
is only done if the MinReadySeconds field is non-zero. For MinReadySeconds = 0,
the available replicas are omitted as they are always equal to the ready replicas.
It is possible to configure the grace period for each state using the
"Kubernetes: Replicas" ruleset.
Please note that replicas may temporarily be in a not ready, out-of-date or
misscheduled state during the process of an update. It is therefore advised to
always have a grace period configured.
One service is created for each Kubernetes object which supports replicas.