NewNop returns a no-op Target.

A HistogramSpec configures histograms.

A Spec configures counters and gauges.

A Counter models monotonically increasing values, like a car's odometer.

A Gauge models moment-in-time measurements, like a car's speedometer.

A Histogram approximates a distribution of values.

A Target bridges the metrics package's representations of counters, gauges, and histograms with push-based telemetry systems.