MetricsSink.counter

void counter(scope  const(char)[]  name,  long  delta =  1,
          scope  const(MetricsTag)[]  tags =  null)

@safe nothrow;

Record a counter increment.

`name`	Metric name (e.g., `"eve.loop.iterations"`).
`delta`	Increment amount (default: 1).
`tags`	Optional tags for dimensional grouping.