Add Metrics

docs/content/observability/metrics/prometheus.md

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+# Prometheus
+
+To enable the Prometheus:
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.prometheus]
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  prometheus: {}
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.prometheus
+```
+
+#### `buckets`
+
+_Optional, Default="0.100000, 0.300000, 1.200000, 5.000000"_
+
+Buckets for latency metrics.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.prometheus]
+    buckets = [0.1,0.3,1.2,5.0]
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  prometheus:
+    buckets:
+    - 0.1
+    - 0.3
+    - 1.2
+    - 5.0
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.prometheus.buckets=0.100000, 0.300000, 1.200000, 5.000000
+```
+
+#### `entryPoint`
+
+_Optional, Default=traefik_
+
+Entry-point used by prometheus to expose metrics.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.prometheus]
+    entryPoint = traefik
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  prometheus:
+    entryPoint: traefik
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.prometheus.entryPoint=traefik
+```
+
+#### `middlewares`
+
+_Optional, Default=""_
+
+Middlewares.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.prometheus]
+    middlewares = ["xxx", "yyy"]
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  prometheus:
+    middlewares:
+    - xxx
+    - yyy
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.prometheus.middlewares="xxx,yyy"
+```
+
+#### `addEntryPointsLabels`
+
+_Optional, Default=true_
+
+Enable metrics on entry points.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.prometheus]
+    addEntryPointsLabels = true
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  prometheus:
+    addEntryPointsLabels: true
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.prometheus.addEntryPointsLabels=true
+```
+
+#### `addServicesLabels`
+
+_Optional, Default=true_
+
+Enable metrics on services.
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.prometheus]
+    addServicesLabels = true
+```
+
+```yaml tab="File (TOML)"
+metrics:
+  prometheus:
+    addServicesLabels: true
+```
+
+```bash tab="CLI"
+--metrics
+--metrics.prometheus.addServicesLabels=true
+```