What does "Does not have minimum availability" in k8s mean?

What does "Does not have minimum availability" mean?

A GitHub discussion was found, but it is not clear to me what the error message means.

As @Tensibai indicated in one the comments, this could be caused as there is insufficient CPU or memory, but that is not always the case.

For example, a helm chart was just deployed, it failed and the workload in GCP indicated that:

Pod errors: CrashLoopBackOff

Based on the comment of @Tensibai the first impression was that there were insufficient resources, but further analysis using kubectl describe pod indicated that in this case the livenessProbe check failed:

Liveness probe failed: Get http://10.16.0.13:80/: dial 
tcp 10.16.0.13:80: getsockopt: connection refused

In summary, the Does not have minimum availability message is generic. Multiple issues could trigger this and more in dept analysis is required to find the actual error.

StackExchange DevOps Q#3980, answer score: 27