Alerts for when active deployment replicas is fewer than desired

[bra...@rabb.it]

I'm having an extremely hard time learning to use prometheus for monitoring my cluster.

 

Are there any nice hand-holding tutorials for creating alerts to watch the health of a cluster and the Kubernetes constructs within. Particularly: alerting when a specific deployment has fewer active replicas than desired for a certain length of time. 

I am using the regular prometheus helm chart for self-managed Kubernetes.

[Meier]

maybe this blog is helpful https://blog.outlyer.com/top-kubernetes-metrics-to-monitor (part4 has links to all parts)

For monitoring if  deployments has fewer active replicas I use this:

(kube_deployment_status_replicas_unavailable > 0)
  or (kube_deployment_status_replicas != kube_deployment_status_replicas_available)
  or (kube_deployment_status_replicas unless kube_deployment_status_replicas_available)