GA4 annotation builder
Record a change you want to remember when reading the data. Pick an event template, complete the text and copy a ready annotation into Google Analytics 4.
Write the annotation
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[NEWSLETTER]
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Description suggestions
Date or date range
In GA4, pick the day the newsletter was sent. If the send was spread over several days, use a date range.
Colour
Purple
A good annotation still helps months later
Use the title for what happened. Use the description for the target, the reason for the change or a note on how to read the data. Keep the goal apart from the observed effect: a campaign launch does not yet tell you its results.
The title fits 60 characters and the description 150. See Google's guide to adding annotations.