add tracing.match example

Signed-off-by: whitneygriffith <[email protected]>

telemetry/v1alpha1/telemetry.proto

@@ -44,6 +44,21 @@ import "google/protobuf/wrappers.proto";
 //
 // ## Examples
 //
+// Policy to tailor the zipkin provider to sample traces from Client workloads only:
+// ```yaml
+// apiVersion: telemetry.istio.io/v1alpha1
+// kind: Telemetry
+// metadata:
+//   name: mesh-default
+//   namespace: istio-system
+// spec:
+//   # no selector specified, applies to all workloads
+//   tracing:
+//   - match: CLIENT
+//   - providers:
+//     - name: "zipkin"
+// ```
+// 
 // Policy to enable random sampling for 10% of traffic:
 // ```yaml
 // apiVersion: telemetry.istio.io/v1alpha1