Introduce trace verbosity config and produce less spans by default

integration/fixtures/k8s/01-traefik-crd.yml

@@ -92,10 +92,21 @@ spec:
                         More info: https://doc.traefik.io/traefik/v3.5/routing/routers/#observability
                       properties:
                         accessLogs:
+                          description: AccessLogs enables access logs for this router.
                           type: boolean
                         metrics:
+                          description: Metrics enables metrics for this router.
                           type: boolean
+                        traceVerbosity:
+                          default: minimal
+                          description: TraceVerbosity defines the verbosity level
+                            of the tracing for this router.
+                          enum:
+                          - minimal
+                          - detailed
+                          type: string
                         tracing:
+                          description: Tracing enables tracing for this router.
                           type: boolean
                       type: object
                     priority:

integration/fixtures/tracing/simple-opentelemetry.toml

@@ -14,6 +14,10 @@
 [entryPoints]
   [entryPoints.web]
     address = ":8000"
+    [entryPoints.web.observability]
+      traceVerbosity = "detailed"
+  [entryPoints.web-minimal]
+    address = ":8001"
 
 # Adding metrics to confirm that there is no wrong interaction with tracing.
 [metrics]
@@ -44,9 +48,13 @@
 ## dynamic configuration ##
 
 [http.routers]
+  [http.routers.routerBasicMinimal]
+    Service = "service0"
+    Rule = "Path(`/basic-minimal`)"
+    [http.routers.routerBasicMinimal.observability]
+      traceVerbosity = "minimal"
   [http.routers.router0]
     Service = "service0"
-    Middlewares = []
     Rule = "Path(`/basic`)"
   [http.routers.router1]
     Service = "service1"