Solution of this problem is discussed at stackoverflow.
https://stackoverflow.com/questions/58637793/jenkins-is-deleting-workspaces-on-slaves
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Jenkins is deleting workspaces on slave machines after 30 days. After
looking into jenkins folder located at
/var/lib/jenkins/logs/tasks
I found logs here with name Workspace\ clean-up.log. Why this is being
created?, I suspect it may be because of
https://wiki.jenkins.io/display/JENKINS/Work