Add k8s resource attributes automatically

Co-authored-by: Romain <rtribotte@users.noreply.github.com>

docs/content/migration/v3.md

@@ -322,9 +322,11 @@ and Traefik now keeps them encoded to avoid any ambiguity.
 
 ## v3.5.0
 
-### TraceVerbosity on Routers and Entrypoints
+### Observability
 
-Starting with v3.5, a new `traceVerbosity` option is available for both entrypoints and routers.
+#### TraceVerbosity on Routers and Entrypoints
+
+Starting with `v3.5.0`, a new `traceVerbosity` option is available for both entrypoints and routers.
 This option allows you to control the level of detail for tracing spans.
 Routers can override the value inherited from their entrypoint.
 
@@ -339,3 +341,20 @@ Possible values are:
 - `detailed`: enables the creation of additional spans for each middleware executed for each request processed by a router.
 
 See the updated documentation for [entrypoints](../reference/install-configuration/entrypoints.md) and [dynamic routers](../reference/dynamic-configuration/file.md#observability-options).
+
+#### K8s Resource Attributes
+
+Since `v3.5.0`, the semconv attributes `k8s.pod.name` and `k8s.pod.uid` are injected automatically in OTel resource attributes when OTel tracing/logs/metrics are enabled.
+
+For that purpose, the following right has to be added to the Traefik Kubernetes RBACs:
+
+```yaml
+  ...
+  - apiGroups:
+      - ""
+    resources:
+      - pods
+    verbs:
+      - get
+  ...
+```