Upstream contribution / engineering case study
PostHog browser lifecycle contribution
A merged contribution addressing final web-vitals delivery as the browser page becomes hidden.
The problem
Browser lifecycle transitions can prevent the last performance measurements from being sent.
Engineering approach
Improve final browser delivery behaviour in the upstream JavaScript SDK.
What this work teaches
Lifecycle edge cases deserve explicit tests, not just happy-path analytics checks.
Evidence and limits
PR merge is independently inspectable; deployment to end users is not asserted.