NewRegistrar returns an initialized health endpoint registrar configured with the given Prometheus.Registerer and map of Prometheus metrics.

StartMetricsServer listens and serves the health endpoint HTTP handler on a given address.

WithCounter will create and register a new counter metric.

WithGauge will create and register a new gauge metric.

WithHistogram will create and register a new Histogram.

WithSummary will create and register a new SummaryVec.

PrometheusRegistrar maintains a list of metrics to be served by the health endpoint server.

Registrar is used to update values of metrics.

RegistrarOption is a function that can be used to set optional configuration when initializing a new PrometheusRegistrar.