From Event Logs to GreptimeDB: How OpenAI's Spark Observability Evolved at Hyperscale
Notes from two OpenAI talks at Apache Community Over Code EU 2026: how Spark observability at OpenAI moved from 30-minute History Server loads to snapshots, a Rust History Server, agents as the first step of investigation, and GreptimeDB as the store for Spark metrics, events, and logs.


















