diagnose-change
Playbook for investigating why a metric moved (or why events stopped): pin the change in time, localize it to a segment, check configuration edits and experiments around that date, and recommend a fix with evidence. Load when the user asks why something changed, dropped, spiked, or stopped.
Pinned to revision 32ca66da5505, so it is the text this page describes rather than whatever the author pushed since.
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