The root cause is still unclear (as to why the certificate became missing), but matchmaking had been restored.
Posted Nov 19, 2020 - 23:22 PST
Monitoring
The issues seems to be the result of a missing certificate on machines running a new commit. The old stack was reactivated, mitigating the issue. Following to ensure full recovery.
Posted Nov 19, 2020 - 23:11 PST
Investigating
Matchmaking was 100% from 22:18 PST to about 22:39 PST.