netflix/spectator

Spectator is a Java library for recording dimensional time-series measurements. Applications create IDs and meters through a Registry, update counters, timers, summaries and gauges, then registry implementations expose or publish measurements. The repository also provides Atlas querying/subscriptions, an HTTP polling endpoint, and optional integrations for JVM/GC, AWS, IPC, logging, Spark and Netflix tagging. The README documents the core instrumentation path; sampled source gives specific evidence for the HTTP endpoint, Atlas subscription refresh and selected integrations, but not every integration’s internal wiring.