Our Jenkins wasn't responding today, so I restart jenkins by deleting the pod.

I check the log file of the Jenkins and found an error message that Jenkins hat 4 plugins in an unhealthy state.

4 failed plugins: pipeline-graph-analysis; pipeline-rest-api; pipeline-stage-view; workflow-aggregator.

I updated the version of the Jenkins Image from 2.316 to 2.326, but the log still contained he same error. I compared plugin versions which Jenkins tried to load to the version on plugins.jenkins.io and found out that 3 of 4 plugins had just released new version 2 days ago.

I changed Jenkins version back to 2.316 and added plugins with previous version to Jenkins definition:

• name: pipeline-graph-analysis
     version: "1.12"
• name: pipeline-rest-api
     version: "2.19"
• name: pipeline-stage-view
     version: "2.19"
• name: workflow-aggregator
     version: "2.6"
   
  After this change, Jenkins started again.