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Grafana Cloud: Grafana Cloud Metrics - Intermittent Write Latency in prod-us-central, prod-us-central-5, and prod-eu-west-0

Timeline of updates

1. resolved2026-03-17 18:22 UTC

   This incident is now resolved. During the incident the Cloud Metrics platform experienced intermittent latency spikes communicating with a backend cloud service in the prod-us-central-0 and prod-us-central-5 regions. During the incident the internal CSP-facing issue was escalated to a P1. After determining the scope of the latency spikes was limited to only one availability zone, the team mitigated the situation by migrating all write traffic from to the single nearly unaffected availability zone. As the CSP service team attempted to remedy the situation, the situation became worse and began affecting the previously unaffected zone. Given this, another mitigation path was needed. Changing the connection strategy employed by Cloud Metrics to a different method was deployed to all environments, stabilizing the write path once again as we found the different connection method was more reliable and not affected by these increases in latency. We have migrated all tenants back to multi-zone write paths and are happy with and confident in the current method of connectivity to the backend cloud service, which is the one we migrated to during the course of the incident. We have no immediate plans to use the previous problematic connectivity method for the foreseeable future.

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