Add Metrics

docs/content/observability/metrics/overview.md

@@ -0,0 +1,26 @@
+# Metrics
+Metrics system
+{: .subtitle }
+
+Traefik supports 4 metrics backends:
+
+- [DataDog](./datadog.md)
+- [InfluxDB](./influxdb.md)
+- [Prometheus](./prometheus.md)
+- [StatsD](./statsd.md)
+
+## Configuration
+
+To enable metrics:
+
+```toml tab="File (TOML)"
+[metrics]
+```
+
+```yaml tab="File (TOML)"
+metrics: {}
+```
+
+```bash tab="CLI"
+--metrics
+```