### Motivation While metrics types are optional in the Prometheus format (and ignored by Prometheus server), some external tools (eg: DataDog) are failing to ingest the metrics exported by Pulsar broker in Prometheus format.
The reason is that we use a custom exporter and we don't mark the metrics types, such as the Prometheus regular libraries are doing. ### Modifications * Ensure metric type is printed, once, before the metric is printed * Removed space after comma in labels. While this is parsed correctly by all implementation, the spec doesn't actually allow a space in that position. [ Full content available at: https://github.com/apache/pulsar/pull/2679 ] This message was relayed via gitbox.apache.org for [email protected]
