For some jobs, there is no recent history available - while for other jobs, the history is complete. For the former, there are no entries in the job history although I made some changes to their configuration. Note that it worked until some unspecific moment in time (about two months ago); it just stopped to work.

For the affected jobs, the little icon with the wrench is missing in the build history. Furthermore, there are no new entries in directory ${JENKINS_HOME}/config-history/jobs/${JOB_NAME}. Thus, it seems that the plugin misses to record changes made to those jobs.

I would like to provide more helpful information. Any idea how to debug this issue?