90% of a Service's Metrics Require Zero Instrumentation Code, Analysis Shows

A software engineer analysed the full metrics output of a production service and found 67 total metric records in its snapshot. Of those, 59 came automatically from the platform runtime and only 6 were written by the service itself. Metrics covering liveness, readiness, build version, broker delivery, Postgres pool state, and Go runtime internals all appeared without a single line of custom instrumentation. The engineer stores metrics as a diffable snapshot file rather than relying on a live scrape endpoint, making changes trackable over time. The finding challenges the common assumption that meaningful observability requires deliberate instrumentation effort from developers.