This morning, the operation team performed a planned Redis Cluster upgrade, starting at 04:40 UTC. Around 04:56 UTC, one of the Redis pod got killed because of Out of Memory issues, causing the Device Auth service to experience connection failure. To resolve this, the operation team increased the memory allocated to the Redis Cluster, starting at 05:05 UTC. The change was fully implemented by 05:14 UTC, and no more error log was seen from the Device Auth service, which was returned to normal operation.