[chef] Where is the history for the knife executing on the open-source chef server?

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For example, after I run a knife command of 'knife cookbook upload
cookbook_name' from a chef workstation or somewhere, where can I find the
history or log about who sent the knife command and when, and what the command
is? I need to monitor all the knife behaviors on the chef server side
centrally.. How to do that?

Thanks!