Draft: Adds total sessions cube query
What does this MR do and why?
This uses a new cube TotalSessions that groups same session to avoid unmerged sessions results in audience dashboard
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| Before | After |
|---|---|
How to set up and validate locally
- Setup product analytics devkit locally.
- Pull from gitlab-org/analytics-section/product-analytics/devkit!148 (merged)
- Update cube schema. If using devkit with docker, just restart cube.
- open audience dashboard for any PA onboarded project
- Total sessions count should be constant for a given date interval at any point of time.
Related to #443624