Geo: significant number of "The project you were looking for could not be found"
I was digging in Kibana for something unrelated and I noticed there are a significant number of "The project you were looking for could not be found" errors.
https://kibana.gprd.gitlab.com/goto/72a019bc358336b4341414007a8a7676
Since gitlab-org/gitlab-ee!4757 we are marking empty repo's as synced, but this is a slightly different error. I wonder if we are trying to sync projects that are deleted in meantime? And if that's the case, do we mark them as synced (or even remove the project registry)? I see retries for several projects, so I guess something is still wrong.
cc @mkozono