feat: User Experience SLI observed

Hercules Merscherrequested to merge
feat/backfill-ux-sli-start-time into master

Description

In some scenarios, the start time is known, but we don't have control of who started the action. Allowing a start_time to be injected in the start method will allow covering such use cases in a simple way. For example, this MR gitlab-org/gitlab!230396 (merged).

Related Issues

Edited by Hercules Merscher

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