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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.

From Event Logs to GreptimeDB: How OpenAI's Spark Observability Evolved at Hyperscale