Degraded Performance

Final update

A routine system maintenance operation at the OS level led to the application of system updates across multiple EC2 instances in our clusters in several AWS regions. These updates included changes to networking components, which inadvertently triggered restarts. As a result, several EC2 nodes failed health checks and temporarily dropped out of the cluster, disrupting high availability and causing partial connectivity issues for some clients and operations. We have since reproduced the issue in a controlled environment and verified the root cause. To prevent a recurrence, we are updating our node maintenance strategy to ensure greater control over the timing and impact of system-level changes and excluding networking components from automated upgrades.

1. Postmortem · Jun 11, 11:49 UTC
   A routine system maintenance operation at the OS level led to the application of system updates across multiple EC2 instances in our clusters in several AWS regions. These updates included changes to networking components, which inadvertently triggered restarts. As a result, several EC2 nodes failed health checks and temporarily dropped out of the cluster, disrupting high availability and causing partial connectivity issues for some clients and operations. We have since reproduced the issue in a controlled environment and verified the root cause. To prevent a recurrence, we are updating our node maintenance strategy to ensure greater control over the timing and impact of system-level changes and excluding networking components from automated upgrades.
2. Resolved · Jun 11, 10:02 UTC
   This incident has been resolved.
3. Monitoring · Jun 11, 09:20 UTC
   A fix has been implemented and we are monitoring the results.
4. Investigating · Jun 11, 08:24 UTC
   We are continuing to investigate this issue.
5. Investigating · Jun 11, 06:51 UTC
   We are currently investigating this issue.