Prometheus Emitter

This extension exposes for collection by a Prometheus server (https://prometheus.io/). Emitter is enabled by setting druid.emitter=prometheus or include prometheus in the composing emitter list.

Configuration

All metric names and labels are reformatted to match Prometheus standards.

• For names: all characters which are not alphanumeric, underscores, or colons (matching ) are replaced with _

Metric mapping

For metrics which are emitted from multiple services with different dimensions, the metric name is prefixed with the service name. e.g.