OpenTelemetry everywhere: Migrating a metrics platform at scale

Good migration write-up from Atlassian: gostatsd to OpenTelemetry Collector across roughly 100,000 hosts in 14 regions, chewing 4.8 billion datapoints a minute down to 220 million. The useful part is what broke: service-based hashing gave them hot shards, so they moved to streamID routing. Retiring the old aggregators freed about 38% of CPU requests, and they open-sourced the delta aggregation processor upstream was missing.