Google seems to be saying. I donβt work at Google, so I can only guess, but I would suggest that it means "changelog", meaning "a small set of commits considered as a unit for merging", like Github PR (pull request). It is displayed here and here (search on the page for "CL created") with the same usage, and it detects all over the place in Angular problems.
If you are more familiar with Github-talk than Google-talk, mentally replace βPRβ with βCLβ, and I think you will have the right idea. :-)
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