refactor(o11y): pass LibraryMetadata directly to GoldenSignalsMetricsRecorder

Instead of manually extracting properties and passing separate tracking arguments to GoldenSignalsMetricsRecorder, this passes the entire LibraryMetadata model and builds the telemetry setup dynamically.

Author: blakeli0

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

@@ -54,9 +54,12 @@ class GoldenSignalsMetricsRecorder {
   final DoubleHistogram clientRequestDurationRecorder;
 
   GoldenSignalsMetricsRecorder(
-      OpenTelemetry openTelemetry, String libraryName, String libraryVersion) {
+      OpenTelemetry openTelemetry, com.google.api.gax.rpc.LibraryMetadata libraryMetadata) {
+    String libraryName =
+        libraryMetadata.artifactName() != null ? libraryMetadata.artifactName() : "";
     io.opentelemetry.api.metrics.MeterBuilder meterBuilder =
         openTelemetry.meterBuilder(libraryName);
+    String libraryVersion = libraryMetadata.version();
     if (libraryVersion != null && !libraryVersion.isEmpty()) {
       meterBuilder.setInstrumentationVersion(libraryVersion);
     }

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

@@ -86,9 +86,7 @@ public ApiTracerFactory withContext(ApiTracerContext context) {
     this.clientLevelTracerContext = context;
     this.metricsRecorder =
         new GoldenSignalsMetricsRecorder(
-            openTelemetry,
-            clientLevelTracerContext.libraryMetadata().artifactName(),
-            clientLevelTracerContext.libraryMetadata().version());
+            openTelemetry, clientLevelTracerContext.libraryMetadata());
     return this;
   }
 }

sdk-platform-java/gax-java/gax/src/test/java/com/google/api/gax/tracing/GoldenSignalsMetricsRecorderTest.java

@@ -62,7 +62,13 @@ void setUp() {
         SdkMeterProvider.builder().registerMetricReader(metricReader).build();
     OpenTelemetry openTelemetry =
         OpenTelemetrySdk.builder().setMeterProvider(meterProvider).build();
-    recorder = new GoldenSignalsMetricsRecorder(openTelemetry, ARTIFACT_NAME, "1.2.3");
+    recorder =
+        new GoldenSignalsMetricsRecorder(
+            openTelemetry,
+            com.google.api.gax.rpc.LibraryMetadata.newBuilder()
+                .setArtifactName(ARTIFACT_NAME)
+                .setVersion("1.2.3")
+                .build());
   }
 
   @Test

sdk-platform-java/gax-java/gax/src/test/java/com/google/api/gax/tracing/GoldenSignalsMetricsTracerTest.java

@@ -68,7 +68,12 @@ void setUp() {
     ticker = new FakeTicker();
     tracer =
         new GoldenSignalsMetricsTracer(
-            new GoldenSignalsMetricsRecorder(openTelemetry, ARTIFACT_NAME, "1.2.3"),
+            new GoldenSignalsMetricsRecorder(
+                openTelemetry,
+                com.google.api.gax.rpc.LibraryMetadata.newBuilder()
+                    .setArtifactName(ARTIFACT_NAME)
+                    .setVersion("1.2.3")
+                    .build()),
             ApiTracerContext.empty(),
             ticker);
   }