Elastic APM tracer implementation

docs/content/observability/tracing/elastic.md

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+# Elastic
+
+To enable the Elastic:
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.elastic]
+```
+
+```yaml tab="File (YAML)"
+tracing:
+  elastic: {}
+```
+
+```bash tab="CLI"
+--tracing.elastic=true
+```
+
+#### `serverURL`
+
+_Optional, Default="http://localhost:8200"_
+
+APM ServerURL is the URL of the Elastic APM server.
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.elastic]
+    serverURL = "http://apm:8200"
+```
+
+```yaml tab="File (YAML)"
+tracing:
+  elastic:
+    serverURL: "http://apm:8200"
+```
+
+```bash tab="CLI"
+--tracing.elastic.serverurl="http://apm:8200"
+```
+
+#### `secretToken`
+
+_Optional, Default=""_
+
+APM Secret Token is the token used to connect to Elastic APM Server.
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.elastic]
+    secretToken = "mytoken"
+```
+
+```yaml tab="File (YAML)"
+tracing:
+  elastic:
+    secretToken: "mytoken"
+```
+
+```bash tab="CLI"
+--tracing.elastic.secrettoken="mytoken"
+```
+
+#### `serviceEnvironment`
+
+_Optional, Default=""_
+
+APM Service Environment is the name of the environment Traefik is deployed in, e.g. `production` or `staging`.
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.elastic]
+    serviceEnvironment = "production"
+```
+
+```yaml tab="File (YAML)"
+tracing:
+  elastic:
+    serviceEnvironment: "production"
+```
+
+```bash tab="CLI"
+--tracing.elastic.serviceenvironment="production"
+```
+
+### Further
+
+Additional configuration of Elastic APM Go agent can be done using environment variables.
+See [APM Go agent reference](https://www.elastic.co/guide/en/apm/agent/go/current/configuration.html).