Google has rolled out some useful features for GA4 that will help users obtain more context at a glance in reports and better understand why (not set) traffic might be appearing in acquisition reports.
Percentage values in Google Analytics report tables
In detailed reports and Ad modules, Google has added a percentage column so users can easily understand the proportion of that dimension against the primary metrics the report is displaying. For example, what percentage of traffic is coming from each default channel group.
Missing session start notification
Where a report has a high volume of missing session_start events, GA4 will flag this and direct the user to articles on how best to resolve this issue.
High not set rate notification
If a detail report contains a high amount of (not set) traffic, Google will display a notification with more information about the issue and directions on how to fix it. An example flag would be “This report contains a (not set) value because no data was received.”
