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In addition to configuring user accounts and access rights, it can also be useful to keep track of the individual user actions: in other words, who did what to your server configuration. This sort of audit trail facility is even required in many organizations.
There are two Jenkins plugins that can help you do this. The Audit Trail plugin keeps a record of user changes in a special log file. And the JobConfigHistory plugin lets you keep a copy of previous versions of the various system and job configuration files that Jenkins uses.