kamon-io/Kamon

i cannot find any metrics exposed via kamon-prometheus

application.conf:

kamon.prometheus {
  include-environment-tags = true
  embedded-server {
    hostname = 0.0.0.0
    port = 9404
  }
}

implementation:

class SinkConnector() extends org.apache.kafka.connect.sink.SinkConnector {
  val underlying: AerospikeSinkConnector = new AerospikeSinkConnector()
  override def start(map: util.Map[String, String]): Unit = {
    Kamon.init()
    Kamon.counter("testing-kamon").withoutTags().increment()
    try {
      underlying.start(map)
    }
    catch {
      case ex: Throwable =>
        println(s"Failure on underlying.start($map)")
        Kamon.counter("underlying-start-connector-failure").withTag("config-file",configFile).withTag("message", ex.getMessage).increment()
        throw ex
    }
    finally {
      Kamon.stopModules()
    }
  }

dependencies:

  "io.kamon" %% "kamon-prometheus" % "2.2.2" exclude("org.slf4j", "slf4j-api"),
  "io.kamon" %% "kamon-core" % "2.1.0" exclude("org.slf4j", "slf4j-api")

I already have JMX Exporter which expose Kafka metrics to 9404, i tried to make Kamon use this port also, when i remove the application.conf and use the default value of port 9095 i cannot port-forward to this port for some reason.

I'm missing something?

Thanks!