Investigate why our dogfood instance stops syncing perms from Bitbucket Server

Created by: unknwon

• Context: https://sourcegraph.slack.com/archives/CHPC7UX16/p1603177885325000?thread_ts=1602726272.261300&cid=CHPC7UX16
• Dashboard: https://k8s.sgdev.org/-/debug/grafana/d/repo-updater/repo-updater
• External service: https://k8s.sgdev.org/site-admin/external-services/RXh0ZXJuYWxTZXJ2aWNlOjM=