Document page_worker_ended telemetry event

[archandatta]

Summary

• adds page_worker_ended to the page category row on the telemetry categories page
• adds a short section explaining page_crashed versus page_worker_ended

Why

Browser images now report a shared worker or service worker that stops running as page_worker_ended. Before, these were reported as page_crashed, which made sessions with no real crash look like they crashed repeatedly. The docs list every event type per category, so the new type belongs in the page row. The added section tells readers that a worker ending is not a crash.

Merge this once the image change (kernel/kernel-images#436) is released. The schema change is kernel/kernel#4615.

Testing

Docs-only change. Not previewed locally.

🤖 Generated with Claude Code

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Note

Low Risk
Documentation-only update with no runtime or API behavior changes in this repo.

Overview
Documents the new page_worker_ended telemetry event under the page browser-activity category so it appears alongside existing lifecycle events in the categories table.

Adds a Renderer crashes and workers ending section that distinguishes page_crashed (renderer “Aw, Snap!” failures) from page_worker_ended (shared/service workers stopping for normal reasons like tab closure or SW updates). It also notes that older browser images may still emit page_crashed for worker shutdowns, which previously made non-crash sessions look like repeated crashes.

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Project	Status	Preview	Updated
Kernel	🟢 Ready	View Preview	Oct 6, 2026, 11:36 AM

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