skywalking-java/docs/en/setup/backend/backend-telemetry.md

Telemetry for backend

By default, the telemetry is disabled by setting selector to none, like this

telemetry:
  selector: ${SW_TELEMETRY:none}
  none:
  prometheus:
    host: ${SW_TELEMETRY_PROMETHEUS_HOST:0.0.0.0}
    port: ${SW_TELEMETRY_PROMETHEUS_PORT:1234}
  so11y:
    prometheusExporterEnabled: ${SW_TELEMETRY_SO11Y_PROMETHEUS_ENABLED:true}
    prometheusExporterHost: ${SW_TELEMETRY_PROMETHEUS_HOST:0.0.0.0}
    prometheusExporterPort: ${SW_TELEMETRY_PROMETHEUS_PORT:1234}

but you can set one of prometheus or so11y to enable them, for more information, refer to the details below.

Prometheus

Prometheus is supported as telemetry implementor. By using this, prometheus collects metrics 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:
  selector: ${SW_TELEMETRY:prometheus}
  prometheus:

Set host and port if needed.

telemetry:
  selector: ${SW_TELEMETRY:prometheus}
  prometheus:
    host: 127.0.0.1
    port: 1543

Grafana Visualization

Provide two grafana dashboard settings.

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

Self Observability

SkyWalking supports to collect telemetry data into OAP backend directly. Users could check them out through UI or GraphQL API then.

Adding following configuration to enable so11y(self-observability) related modules.

receiver-so11y:
  selector: ${SW_RECEIVER_SO11Y:default}
  default:
telemetry:
  selector: ${SW_TELEMETRY:so11y}
  # ... other configurations

Another example represents how to combine promethues and so11y. Adding some items in so11y to make it happen.

telemetry:
  selector: ${SW_TELEMETRY:so11y}
  so11y:
    prometheusExporterEnabled: true
    prometheusExporterHost: 0.0.0.0
    prometheusExporterPort: 1234

Then prometheus exporter is listening on 0.0.0.0:1234.