Post Mortem - Database Cluster Overload

What happened

Blockbrain experienced a temporary outage affecting our production database cluster.
The primary node of the cluster suffered a CPU overload, which led to partial unavailability and degraded performance for some customers.
The overload occurred while we were running a data ownership transfer script.
This script executed queries that read an entire collection with millions of records without proper indexing, causing excessive load on ...

Agent Service recovered.

Agent Service recovered.

Sentinel Web App recovered.

Authentication Backend recovered.

Authentication Backend recovered.