Gauge

Gauge metric, to report instantaneous values.

Gauges can go both up and down.

An Example With No Labels:

for {
  cr <- CollectorRegistry.build
  gauge <- Gauge.noLabels(cr, "gauge_value", "Gauge Help")
  _ <- gauge.inc
  _ <- gauge.dec
} yield ()

An Example With Labels:

for {
  cr <- CollectorRegistry.build
  gauge <- Gauge.labelled(cr, "gauge_value", "Gauge Help", Sized("foo"), {s: String => Sized(s)})
  _ <- gauge.label("bar").inc
  _ <- gauge.label("bar").dec
  _ <- gauge.label("baz").inc
  _ <- gauge.label("baz").dec

These can be aggregated and processed together much more easily in the Prometheus server than individual metrics for each labelset.