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Document page_worker_ended telemetry event #670

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Document page_worker_ended telemetry event #670

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0231307
Document worker_ended telemetry event
archandatta Oct 5, 2026
f84d13d
Rename worker_ended to page_worker_ended
archandatta Oct 6, 2026
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8 changes: 7 additions & 1 deletion browsers/telemetry/categories.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -121,7 +121,7 @@ These categories report what's happening in the page. Capturing any of them atta
| --- | --- | --- |
| `console` | Console output from the page | `console_log`, `console_error` |
| `network` | Network requests, responses, and failures | `network_request`, `network_response`, `network_loading_failed`, `network_idle`, `proxy_error` |
| `page` | Navigation and page lifecycle, including performance signals and renderer crashes | `page_navigation`, `page_dom_content_loaded`, `page_load`, `page_tab_opened`, `page_crashed`, `page_layout_shift`, `page_lcp`, `page_layout_settled`, `page_navigation_settled` |
| `page` | Navigation and page lifecycle, including performance signals, renderer crashes, and workers ending | `page_navigation`, `page_dom_content_loaded`, `page_load`, `page_tab_opened`, `page_crashed`, `page_worker_ended`, `page_layout_shift`, `page_lcp`, `page_layout_settled`, `page_navigation_settled` |
| `interaction` | Browser-native input in the page (clicks, keys, scroll) | `interaction_click`, `interaction_key`, `interaction_scroll_settled` |
| `screenshot` | Periodic screenshots of the session | `monitor_screenshot` |

Expand Down Expand Up @@ -151,6 +151,12 @@ The 1 s layout window covers late-loading web fonts and deferred image reflows.

Kernel computes `interaction_scroll_settled` the same way: it fires 300 ms after the last `scroll` event on a target, and only when the position moved more than 5 px on either axis, so scroll jitter doesn't emit an event.

### Renderer crashes and workers ending

`page_crashed` reports that a page's renderer process crashed (an "Aw, Snap!" failure) while the browser stayed up. Data from browser images released before `page_worker_ended` can also contain `page_crashed` events for shared and service workers.

`page_worker_ended` reports that a shared worker or service worker stopped running, for example when a shared worker closes itself or the last tab using it closes, or when a newer version replaces a service worker. Chrome doesn't stop idle service workers while telemetry is attached to them, so idle timeouts don't produce this event. A worker ending isn't a crash. Chrome reports a worker that ended normally the same way as one whose process exited, so both produce `page_worker_ended`. When a renderer crashes, each page it hosted still reports `page_crashed`.

### The monitor category

`monitor` reports the health of the CDP collector itself: `monitor_disconnected`, `monitor_reconnected`, `monitor_reconnect_failed`, and `monitor_init_failed`.
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