Add Metrics

docs/content/observability/metrics/datadog.md

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+# DataDog
+
+To enable the DataDog:
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.dataDog]
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.datadog
+```
+
+#### `address`
+
+_Required, Default="127.0.0.1:8125"_
+
+Address instructs exporter to send metrics to datadog-agent at this address.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.dataDog]
+    address = "127.0.0.1:8125"
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  dataDog:
+    address: 127.0.0.1:8125
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.datadog.address="127.0.0.1:8125"
+```
+
+#### `addEntryPointsLabels`
+
+_Optional, Default=true_
+
+Enable metrics on entry points.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.dataDog]
+    addEntryPointsLabels = true
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  dataDog:
+    addEntryPointsLabels: true
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.datadog.addEntryPointsLabels=true
+```
+
+#### `addServicesLabels`
+
+_Optional, Default=true_
+
+Enable metrics on services.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.dataDog]
+    addServicesLabels = true
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  dataDog:
+    addServicesLabels: true
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.datadog.addServicesLabels=true
+```
+
+#### `pushInterval`
+
+_Optional, Default=10s_
+
+The interval used by the exporter to push metrics to datadog-agent.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.dataDog]
+    pushInterval = 10s
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  dataDog:
+    pushInterval: 10s
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.datadog.pushInterval=10s
+```
+