mark Lightstep provider deprecated

mesh/v1alpha1/config.proto

@@ -486,11 +486,10 @@ message MeshConfig {
       EnvoyExternalAuthorizationGrpcProvider envoy_ext_authz_grpc = 3;
       // Configures a tracing provider that uses the Zipkin API.
       ZipkinTracingProvider zipkin = 4;
+      // $hide_from_docs
       // Configures a Lightstep tracing provider.
-      // Note: For Istio 1.15+, configuring this provider will result in
-      // using an OpenTelemetryTracingProvider configured specially for 
-      // Lightstep. This is part of the Lightstep transition to OpenTelemetry.
-      LightstepTracingProvider lightstep = 5;
+      // Deprecated: For Istio 1.15+, please use an OpenTelemetryTracingProvider instead, more details can be found at https://github.com/istio/istio/issues/40027
+      LightstepTracingProvider lightstep = 5 [deprecated=true];
       // Configures a Datadog tracing provider.
       DatadogTracingProvider datadog = 6;
       // Configures a Stackdriver provider.

proto.lock

@@ -34981,7 +34981,13 @@
                   {
                     "id": 5,
                     "name": "lightstep",
-                    "type": "LightstepTracingProvider"
+                    "type": "LightstepTracingProvider",
+                    "options": [
+                      {
+                        "name": "deprecated",
+                        "value": "true"
+                      }
+                    ]
                   },
                   {
                     "id": 6,

releasenotes/notes/2635.yaml

@@ -0,0 +1,10 @@
+apiVersion: release-notes/v2
+
+kind: feature
+area: telemetry
+issue:
+  - https://github.com/istio/istio/issues/40027
+
+releaseNotes:
+  - |
+    **Deprecated** Lightstep provider, please use OpenTelemetry provider instead.