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This check monitors the number of replicas in a Kubernetes deployment.
The state of the check is dependent on the configuration of the deployment
If a deployment is paused or defined with the strategy "Recreate" the
check will always return OK. If a deployment uses the strategy
"RollingUpdate" the check will return CRIT if the number of ready replicas
falls below the maximum unavailable limit or rises above the max surge
The maximum unavailable and maximum surge limits of Kubernetes can be
either absolute or in percent. Surge levels in percent are rounded up and
unavailable levels are rounded down. Even a definition of mixed levels
is possible. If e.g. 10 replicas are expected and max unavailable is 1
and max surge is 25% the check will return CRIT if the number of
is below 9 or raises above 13 replicas, respectively.
One service is created.