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Maniphest T239382

User traffic sometimes gets HTTP 502 from ATS
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Description

In Logstash, I'm seeing various web requests from users for /w/load.php resulting in HTTP 502 responses from ATS.

Dashboard: https://logstash.wikimedia.org/goto/331782f9800a9085915426f5284abf35.

On IRC, @Vgutierrez mentioned this usually means there was an issue fetching the response from an origin server (e.g. varnish-fe from ATS-fe, or mw-app-layer from ATS-be; not sure which one).

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Krinkle created this task.Nov 28 2019, 3:36 AM
Restricted Application added a project: SRE. · View Herald TranscriptNov 28 2019, 3:36 AM
Restricted Application added a subscriber: Aklapper. · View Herald Transcript
Krinkle moved this task from Limbo to Watching on the Performance-Team (Radar) board.Nov 28 2019, 3:36 AM
jbond triaged this task as Medium priority.Nov 28 2019, 4:30 PM
• ema moved this task from Backlog to Caching on the Traffic board.Nov 29 2019, 2:18 PM
Aklapper mentioned this in T247454: 502 Server Hangup Error on esams for "Upload a new version of this file" on Special:Upload on Commons.Jun 15 2021, 7:06 AM
BBlack closed this task as Declined.Oct 8 2021, 5:18 PM
BBlack subscribed.

Declining this one, as whatever this was, the report is now ~2 years old and everything related has changed or been refined substantially since (and ATS-TLS itself is in the process of being replaced anyways!).

Aklapper mentioned this in T295343: File upload not working: Error: 502, Next Hop Connection Failed.Nov 9 2021, 11:04 AM
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