NewCounter constructs a new StandardCounter.

Create a new registry.

StandardCounter is the standard implementation of a Counter and uses the sync/atomic package to manage a single int64 value.

The standard implementation of a Registry is a mutex-protected map of names to metrics.

Counters hold an int64 value that can be incremented and decremented.

CounterSnapshot is a read-only copy of another Counter.

DuplicateMetric is the error returned by Registry.Register when a metric already exists.