Q: How do I mark a site change or campaign launch directly on GA4 charts?

Q: How do I mark a site change or campaign launch directly on GA4 charts?
A: GA4 finally has native annotations:
— Admin → Data display → Annotations → 'Create annotation'.
— Set the date (or date range), write the note (e.g. 'Migrated to new checkout'), and save.
— Open any report's time-series chart — the annotation marker appears on that date for everyone with access.
— Use them religiously before site migrations or tag changes so future-you can explain the traffic dip.
TL;DR: Create annotations under Admin → Data display; markers show on every report chart so the whole team can read the timeline.
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