Resolved
GitHub resolved their incident. We confirm that newer jobs are processed fine and within expected queueing time.
Monitoring
Our telemetry confirms that newer jobs are processed successfully and within the expected queue time. Older jobs may have been affected by the GitHub outage and are still in a bad state, so they are unable to make progress.
GitHub is still working on remediations to unblock these jobs: https://www.githubstatus.com/incidents/l76qh74ryp16.
Monitoring
Namespace team keeps monitoring the GitHub outage.
Investigating
GitHub reported an outage: https://www.githubstatus.com/incidents/plgzz71xn6zq. Our telemetry confirms that no events related to customer jobs are received.