The issue today around 1:40pm PST was similar to issue that occurred two days ago in the data logging tier which affected data flow, WMC and Agent communications. Although service was restored shortly thereafter, the team will continue to investigate, monitor and isolate until we find the root cause. More details to come.
Update 12/1/2020
Root Cause:
The possible cause has been isolated to rollout of a new backend service in Harmony that may have caused load on the data tier. This service exhibited the same behavior the next day and the change was subsequently rolled back.
Engineering is doing further investigation on improving future re-deployments of this service.