Cannot upload artefacts

I’m running gitlab via a docker container in unraid, which is also host to the gitlab runner. HAProxy sits in front of gitlab.
This previous worked, but recently it refuses to upload artefacts - necessary for later steps in the build.

  • gitlab is on version 13.6.1-ee (a0e59de39b3)
  • gitlab runner is on version 13.6.0

Both of those were the latest available at time of writing, as I generally keep things fairly up to date. It’s possible that this was caused by the transition from the last version to this one, but sadly I can’t say that for certain.

Here is an excerpt from the logs (with the token truncated intentionally)

Has anyone else seen this one? Any debugging ideas?