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Document how k8s logging works
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Description

logging to logstash is one of the things you get for "free" as part of deploying your application on Kubernetes. We should document how this works, and what modifications, if any, applications need to make to get the full benefits of structured logging.

T207200: Revisit the logging work done on Q1 2017-2018 for the standard pod setup and T276374: Figure out what production logging config needs to look like may provide some notes on how this works.

Ideally this would be captured at a new https://wikitech.wikimedia.org/wiki/Kubernetes/Logging page.

Event Timeline

I 've went ahead and added quite a bit of information to https://wikitech.wikimedia.org/wiki/Kubernetes/Logging page. Let me know if that helps and what more you would like to see there.