GitLab service instabilities as of Wednesday 05th October. It is strongly recommended to not do any git operation while the issue is being fixed.
More info under https://cern.service-now.com/service-portal?id=outage&n=OTG0073435
this MR is a manual sweep of !30831 (merged) into 21.3 and master. The automatic sweep was not triggered by gitlab (cf. ATLINFR-3448).