Steps to replicate the issue (include links if applicable):

• Upload a file and receive an error
• 04369: finalize/189> Still waiting for server to publish uploaded file
• 04374: FAILED: stashfailed: An unknown error occurred in storage backend "local-swift-codfw".

What happens?:
Swift is returning a lot of 503s
https://grafana.wikimedia.org/goto/LtAe0rSHR?orgId=1

What should have happened instead?:
No 503s should be happening

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

Previous occurrences of this are:

• T369388
• T328872