Temporal incident

Some customers in AWS us-east-1 experienced a small number of gRPC UNIMPLEMENTED errors

Notice Resolved View vendor source →

Temporal experienced a notice incident on May 28, 2026 affecting us-east-1, lasting 1d 1h. The incident has been resolved; the full update timeline is below.

Started
May 28, 2026, 08:22 PM UTC
Resolved
May 29, 2026, 10:14 PM UTC
Duration
1d 1h
Detected by Pingoru
May 28, 2026, 08:22 PM UTC

Affected components

us-east-1

Update timeline

  1. identified May 28, 2026, 08:22 PM UTC

    Some customers in AWS us-east-1 experienced a small number of gRPC UNIMPLEMENTED errors today from 19:40 to 20:05 UTC. We have currently mitigated the issue and are working on a permanent fix at this time.

  2. monitoring May 28, 2026, 09:00 PM UTC

    The gRPC UNIMPLEMENTED errors previously observed have been mitigated. We are continuing to monitor the situation and are working towards a permanent fix at this time.

  3. monitoring May 28, 2026, 10:14 PM UTC

    Service has remained stable and we are continuing to monitor the situation. We will continue to provide updates as they become available.

  4. monitoring May 28, 2026, 11:17 PM UTC

    We have confirmed the service is now stable and are now working to ensure a permanent fix is in place to prevent any recurrence.

  5. monitoring May 29, 2026, 02:11 AM UTC

    The service remains stable. We are continuing to monitor closely while work progresses on a permanent fix to prevent recurrence.

  6. monitoring May 29, 2026, 10:48 AM UTC

    The service continues to operate normally. We will provide additional updates as they become available.

  7. resolved May 29, 2026, 10:14 PM UTC

    The service has remained stable since the initial behavior was observed 5/28 19:40 to 20:05 UTC. A permanent fix for the region is now in-progress.