feat(o11y): configure instrumentation version on open telemetry meter

Updated GoldenSignalsMetricsRecorder to automatically apply the library version retrieved from LibraryMetadata as the instrumentation version on the built OpenTelemetry Meter.

Author: blakeli0

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

@@ -53,8 +53,14 @@ class GoldenSignalsMetricsRecorder {
           900.0, 3600.0);
   final DoubleHistogram clientRequestDurationRecorder;
 
-  GoldenSignalsMetricsRecorder(OpenTelemetry openTelemetry, String libraryName) {
-    Meter meter = openTelemetry.meterBuilder(libraryName).build();
+  GoldenSignalsMetricsRecorder(
+      OpenTelemetry openTelemetry, String libraryName, String libraryVersion) {
+    io.opentelemetry.api.metrics.MeterBuilder meterBuilder =
+        openTelemetry.meterBuilder(libraryName);
+    if (libraryVersion != null && !libraryVersion.isEmpty()) {
+      meterBuilder.setInstrumentationVersion(libraryVersion);
+    }
+    Meter meter = meterBuilder.build();
 
     this.clientRequestDurationRecorder =
         meter

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

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

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

@@ -62,7 +62,7 @@ void setUp() {
         SdkMeterProvider.builder().registerMetricReader(metricReader).build();
     OpenTelemetry openTelemetry =
         OpenTelemetrySdk.builder().setMeterProvider(meterProvider).build();
-    recorder = new GoldenSignalsMetricsRecorder(openTelemetry, ARTIFACT_NAME);
+    recorder = new GoldenSignalsMetricsRecorder(openTelemetry, ARTIFACT_NAME, "1.2.3");
   }
 
   @Test

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

@@ -68,7 +68,7 @@ void setUp() {
     ticker = new FakeTicker();
     tracer =
         new GoldenSignalsMetricsTracer(
-            new GoldenSignalsMetricsRecorder(openTelemetry, ARTIFACT_NAME),
+            new GoldenSignalsMetricsRecorder(openTelemetry, ARTIFACT_NAME, "1.2.3"),
             ApiTracerContext.empty(),
             ticker);
   }