Atlassian has reported an incident which occured between 01:00 UTC and 07:25 UTC:
https://jira-software.status.atlassian.com/incidents/vwrp378v0zmk

This resulted in Tempo failing to load for many customers. The incident has resolved and Tempo services are confirmed to be working normally.

All data validation has completed.

The incident has been resolved.
During the incident we had to block Jira Issue webhook processing, but any updates in Jira since September 16th at 8:30pm have been processed normally.

This incident has been resolved. The affected Tempo apps have been restored and are operating normally for impacted customers. A fix has been deployed to prevent recurrence. If you're still experiencing issues, please contact Tempo Support.

This incident has been resolved.

The issue has been resolved.