fix(observability): populate rpc.method for HTTP json transport

Author: blakeli0

bazel-google-cloud-java-2

@@ -0,0 +1 @@
+/private/var/tmp/_bazel_blakeli/32c27350f2eca8f4de729224e67247b0/execroot/_main

sdk-platform-java/.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "java.compile.nullAnalysis.mode": "automatic"
+}

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/tracing/ApiTracerContext.java

@@ -194,7 +194,7 @@ public Map<String, Object> getAttemptAttributes() {
         attributes.put(ObservabilityAttributes.VERSION_ATTRIBUTE, libraryMetadata().version());
       }
     }
-    if (transport() == Transport.GRPC && !Strings.isNullOrEmpty(fullMethodName())) {
+    if (!Strings.isNullOrEmpty(fullMethodName())) {
       attributes.put(ObservabilityAttributes.GRPC_RPC_METHOD_ATTRIBUTE, fullMethodName());
     }
     if (transport() == Transport.HTTP) {
@@ -232,7 +232,7 @@ Map<String, Object> getMetricsAttributes() {
     if (!Strings.isNullOrEmpty(rpcSystemName())) {
       attributes.put(ObservabilityAttributes.RPC_SYSTEM_NAME_ATTRIBUTE, rpcSystemName());
     }
-    if (transport() == Transport.GRPC && !Strings.isNullOrEmpty(fullMethodName())) {
+    if (!Strings.isNullOrEmpty(fullMethodName())) {
       attributes.put(ObservabilityAttributes.GRPC_RPC_METHOD_ATTRIBUTE, fullMethodName());
     }
     if (!Strings.isNullOrEmpty(urlDomain())) {

sdk-platform-java/java-showcase/gapic-showcase/src/test/java/com/google/showcase/v1beta1/it/ITOtelGoldenMetrics.java

@@ -254,7 +254,7 @@ void testMetrics_successfulEcho_httpjson() throws Exception {
           .isEqualTo("v1beta1/echo:echo");
       assertThat(
               attributes.get(AttributeKey.stringKey(ObservabilityAttributes.GRPC_RPC_METHOD_ATTRIBUTE)))
-          .isNull(); 
+          .isEqualTo("google.showcase.v1beta1.Echo/Echo"); 
     }
   }