Manage observability at entrypoint and router level

Co-authored-by: Kevin Pollet <pollet.kevin@gmail.com>

docs/content/observability/metrics/datadog.md

@@ -68,6 +68,7 @@ metrics:
 ```bash tab="CLI"
 --metrics.datadog.addEntryPointsLabels=true
 ```
+
 #### `addRoutersLabels`
 
 _Optional, Default=false_

docs/content/observability/overview.md

@@ -5,16 +5,80 @@ description: "Traefik provides Logs, Access Logs, Metrics and Tracing. Read the
 
 # Overview
 
-Traefik's Observability system
-{: .subtitle }
+Traefik’s observability features include logs, access logs, metrics, and tracing. You can configure these options globally or at more specific levels, such as per router or per entry point.
 
-## Logs
+## Configuration Example
+
+Enable access logs, metrics, and tracing globally
+
+```yaml tab="File (YAML)"
+accessLog: {}
+
+metrics:
+  otlp: {}
+
+tracing: {}
+```
+
+```yaml tab="File (TOML)"
+[accessLog]
+
+[metrics]
+  [metrics.otlp]
+
+[tracing]
+```
+
+```bash tab="CLI"
+--accesslog=true
+--metrics.otlp=true
+--tracing=true
+```
+
+You can disable access logs, metrics, and tracing for a specific entrypoint attached to a router:
+
+```yaml tab="File (YAML)"
+# Static Configuration
+entryPoints:
+  EntryPoint0:
+    address: ':8000/udp'
+    observability:
+      accessLogs: false
+      tracing: false
+      metrics: false
+```
+
+```toml tab="File (TOML)"
+# Static Configuration
+[entryPoints.EntryPoint0]
+  address = ":8000/udp"
+
+    [entryPoints.EntryPoint0.observability]
+      accessLogs = false
+      tracing = false
+      metrics = false
+```
+
+```bash tab="CLI"
+# Static Configuration
+--entryPoints.EntryPoint0.address=:8000/udp
+--entryPoints.EntryPoint0.observability.accessLogs=false
+--entryPoints.EntryPoint0.observability.metrics=false
+--entryPoints.EntryPoint0.observability.tracing=false
+```
+
+!!!note "Default Behavior"
+    A router with its own observability configuration will override the global default.
+
+## Configuration Options
+
+### Logs
 
 Traefik logs informs about everything that happens within Traefik (startup, configuration, events, shutdown, and so on).
 
 Read the [Logs documentation](./logs.md) to learn how to configure it.
 
-## Access Logs
+### Access Logs
 
 Access logs are a key part of observability in Traefik.
 
@@ -24,7 +88,7 @@ including the source IP address, requested URL, response status code, and more.
 
 Read the [Access Logs documentation](./access-logs.md) to learn how to configure it.
 
-## Metrics
+### Metrics
 
 Traefik offers a metrics feature that provides valuable insights about the performance and usage.
 These metrics include the number of requests received, the requests duration, and more.
@@ -33,7 +97,7 @@ On top of supporting metrics in the OpenTelemetry format, Traefik supports the f
 
 Read the [Metrics documentation](./metrics/overview.md) to learn how to configure it.
 
-## Tracing
+### Tracing
 
 The Traefik tracing system allows developers to gain deep visibility into the flow of requests through their infrastructure.