in core/src/main/java/com/spotify/metrics/core/InstrumentedExecutorService.java [73:84]
public InstrumentedExecutorService(
ExecutorService delegate,
SemanticMetricRegistry registry,
MetricId baseMetricId) {
MetricId baseMetricIdWithUnit = baseMetricId.tagged("unit", "task");
this.delegate = delegate;
this.submitted = registry.meter(baseMetricIdWithUnit.tagged("what", "submitted"));
this.running = registry.counter(baseMetricIdWithUnit.tagged("what", "running"));
this.completed = registry.meter(baseMetricIdWithUnit.tagged("what", "completed"));
this.idle = registry.timer(baseMetricId.tagged("what", "idle"));
this.duration = registry.timer(baseMetricId.tagged("what", "duration"));
}