Telemetry for backend

In default, the telemetry is off, like this

telemetry:
  none:

Prometheus

Prometheus is supported as telemetry implementor. By using this, prometheus collects metric from skywalking backend.

Set prometheus to provider. The endpoint open at http://0.0.0.0:1234/ and http://0.0.0.0:1234/metrics.

telemetry:
  prometheus:

Set host and port if needed.

telemetry:
  prometheus:
    host: 127.0.0.1
    port: 1543

Provide two grafana dashboard settings.

Use SkyWalking trace-mode dashboard when SkyWalking is used with tracing agent.
Use SkyWalking mesh-mode dashboard when SkyWalking is used with service mesh telemetry, including istio, envoy.