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

Affected components: Amazon Web Services (AWS) - us-east-1us-east-1

Timeline of updates

1. identified2026-05-28 20:22 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 identified a root cause and are currently working towards a permanent fix.

2. monitoring2026-05-28 21:00 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. monitoring2026-05-28 22:14 UTC

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

4. monitoring2026-05-28 23:17 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. We will continue to monitor for errors until the fix is deployed.

5. monitoring2026-05-29 02:11 UTC

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

6. monitoring2026-05-29 10:48 UTC

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

7. resolved2026-05-29 22:14 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.

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Temporal Cloud profile · Recent Temporal Cloud incidents · Markdown · JSON