Split Web into API/Dashboard, ping, metric and Rest Provider

docs/configuration/metrics.md

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+# Metrics Definition
+
+## Prometheus
+
+```toml
+# Metrics definition
+[metrics]
+  #...
+
+  # To enable Traefik to export internal metrics to Prometheus
+  [metrics.prometheus]
+
+    # Buckets for latency metrics
+    #
+    # Optional
+    # Default: [0.1, 0.3, 1.2, 5]
+    #
+    buckets = [0.1,0.3,1.2,5.0]
+
+  # ...
+```
+
+## DataDog
+
+```toml
+# Metrics definition
+[metrics]
+  #...
+
+  # DataDog metrics exporter type
+  [metrics.datadog]
+
+    # DataDog's address.
+    #
+    # Required
+    # Default: "localhost:8125"
+    #
+    address = "localhost:8125"
+
+    # DataDog push interval
+    #
+    # Optional
+    # Default: "10s"
+    #
+    pushInterval = "10s"
+
+  # ...
+```
+
+## StatsD
+
+```toml
+# Metrics definition
+[metrics]
+  #...
+
+  # StatsD metrics exporter type
+  [metrics.statsd]
+
+    # StatD's address.
+    #
+    # Required
+    # Default: "localhost:8125"
+    #
+    address = "localhost:8125"
+
+    # StatD push interval
+    #
+    # Optional
+    # Default: "10s"
+    #
+    pushInterval = "10s"
+
+  # ...
+```
+### InfluxDB
+
+```toml
+[web]
+  # ...
+
+  # InfluxDB metrics exporter type
+  [web.metrics.influxdb]
+
+    # InfluxDB's address.
+    #
+    # Required
+    # Default: "localhost:8089"
+    #
+    address = "localhost:8089"
+
+    # InfluxDB push interval
+    #
+    # Optional
+    # Default: "10s"
+    #
+    pushinterval = "10s"
+
+  # ...
+```
+
+## Statistics
+
+```toml
+# Metrics definition
+[metrics]
+  # ...
+
+  # Enable more detailed statistics.
+  [metrics.statistics]
+
+    # Number of recent errors logged.
+    #
+    # Default: 10
+    #
+    recentErrors = 10
+
+  # ...
+```