Fix zipkin receiver compatibility with application/x protobuf content type (#13773)

Author: peachisai

docs/en/changes/changes.md

@@ -168,6 +168,7 @@
 * Update Istio E2E test versions: remove EOL 1.20.0, add 1.25.0–1.29.0 for ALS/Metrics/Ambient tests. Update Rover with Istio Process test from 1.15.0 to 1.28.0 with Kubernetes 1.28.
 * Support Virtual-GenAI monitoring.
 * Fix on-demand pod log parsing failure by replacing invalid `DateTimeFormatter` pattern with `ISO_OFFSET_DATE_TIME`.
+* Fix Zipkin receiver compatibility with application/x-protobuf Content-Type.
 
 
 #### UI

oap-server/server-receiver-plugin/zipkin-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/zipkin/handler/ZipkinSpanHTTPHandler.java

@@ -22,6 +22,7 @@
 import com.linecorp.armeria.common.HttpRequest;
 import com.linecorp.armeria.common.HttpResponse;
 import com.linecorp.armeria.common.HttpStatus;
+import com.linecorp.armeria.server.annotation.Consumes;
 import com.linecorp.armeria.server.annotation.ConsumesJson;
 import com.linecorp.armeria.server.annotation.ConsumesProtobuf;
 import com.linecorp.armeria.server.annotation.Post;
@@ -82,6 +83,12 @@ public HttpResponse collectV2ProtobufSpans(HttpRequest req) {
         return doCollectSpans(SpanBytesDecoder.PROTO3, req);
     }
 
+    @Post("/api/v2/spans")
+    @Consumes("application/x-protobuf")
+    public HttpResponse collectV2XProtobufSpans(HttpRequest req) {
+        return doCollectSpans(SpanBytesDecoder.PROTO3, req);
+    }
+
     @Post("/api/v1/spans")
     public HttpResponse collectV1Spans(HttpRequest req) {
         return doCollectSpans(SpanBytesDecoder.JSON_V1, req);