zopu-code/repos/effect/.changeset/fix-otel-logger-clock-skew.md

@effect/opentelemetry

@effect/opentelemetry
patch

Use monotonic clock for log timestamps to match span timestamps.

The Logger used Date.now() (wall clock) for log timestamp while the Tracer used clock.currentTimeNanosUnsafe() (monotonic clock) for span startTime. This caused logs to appear before their parent span due to clock drift between the two sources. Both now use the same monotonic clock via nanosToHrTime(clock.currentTimeNanosUnsafe()).