| Krinkle | |
| Aug 19 2026, 11:36 PM |
| F99308567: Screenshot 2026-08-20 at 17.17.57.png | |
| Aug 21 2026, 12:18 AM |
| F99180066: Screenshot 2026-08-19 at 16.38.48.png | |
| Aug 19 2026, 11:41 PM |
| F99179614: Screenshot 2026-08-19 at 16.35.16.png | |
| Aug 19 2026, 11:36 PM |
The MediaWiki Entrypoint Profiling: One component dashboard in Grafana plots the Arc Lamp flame graph samples as collected in wmf-config and attributed to ProfilerContext::getHandlerMetricPrefix, which we set as:
ProfilingContext::singleton()->init( MW_ENTRY_POINT, $actionName );
This means 10% of the time spent on mw-web and mw-api servers is unattributed. That's quite a big telemetry gap.
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Open | None | T432486 FY2026-2027 ST6.4 Logged-in user performance (tracking) | |||
| Open | Krinkle | T432488 [Hypothesis] ST6.4.2 Increase MediaWiki backend capacity for logged-in pageviews (tracking) FY2026-2027 | |||
| Resolved | Krinkle | T435422 10% of flame graph samples attributed to unknown_unknown |
The data attributed to "unknown_unknown" is collected with the same internal breakdown and granularity as everything else, so we can drill into like like any other entyrpoint to see what traffic might attributed to it.
They're almost all POST requests, and spend their time in core_JobQueue. Browsing through entrypoints in operations/mediawiki-config (/w and /rpc) they all set MW_ENTRY_POINT, except one: rpc/RunSingleJob.php.
Change #1327219 had a related patch set uploaded (by Krinkle; author: Krinkle):
[operations/mediawiki-config@master] RunSingleJob: Define MW_ENTRY_POINT for flamegraph sample attribution
Change #1327219 merged by jenkins-bot:
[operations/mediawiki-config@master] RunSingleJob: Define MW_ENTRY_POINT for flamegraph sample attribution
Mentioned in SAL (#wikimedia-operations) [2026-08-20T21:27:20Z] <krinkle@deploy1003> Started scap sync-world: Backport for [[gerrit:1327219|RunSingleJob: Define MW_ENTRY_POINT for flamegraph sample attribution (T435422)]]
Mentioned in SAL (#wikimedia-operations) [2026-08-20T21:29:26Z] <krinkle@deploy1003> krinkle: Backport for [[gerrit:1327219|RunSingleJob: Define MW_ENTRY_POINT for flamegraph sample attribution (T435422)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.
Mentioned in SAL (#wikimedia-operations) [2026-08-20T21:35:50Z] <krinkle@deploy1003> Finished scap sync-world: Backport for [[gerrit:1327219|RunSingleJob: Define MW_ENTRY_POINT for flamegraph sample attribution (T435422)]] (duration: 08m 30s)
Change #1327652 had a related patch set uploaded (by Krinkle; author: Krinkle):
[operations/mediawiki-config@master] RunSingleJob: Add ProfilingContext::init()
Change #1327652 merged by jenkins-bot:
[operations/mediawiki-config@master] RunSingleJob: Add ProfilingContext::init()
Mentioned in SAL (#wikimedia-operations) [2026-08-20T23:30:59Z] <krinkle@deploy1003> Started scap sync-world: Backport for [[gerrit:1327652|RunSingleJob: Add ProfilingContext::init() (T435422)]]
Mentioned in SAL (#wikimedia-operations) [2026-08-20T23:33:05Z] <krinkle@deploy1003> krinkle: Backport for [[gerrit:1327652|RunSingleJob: Add ProfilingContext::init() (T435422)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.
Mentioned in SAL (#wikimedia-operations) [2026-08-20T23:43:04Z] <krinkle@deploy1003> Finished scap sync-world: Backport for [[gerrit:1327652|RunSingleJob: Add ProfilingContext::init() (T435422)]] (duration: 12m 06s)
