feat: add gcp client attributes for Opentelemetry traces (#2215)

Author: surbhigarg92

observability-test/observability.ts

@@ -142,6 +142,24 @@ describe('startTrace', () => {
         'Missing OTEL_SCOPE_VERSION attribute'
       );
 
+      assert.equal(
+        span.attributes['gcp.client.service'],
+        'spanner',
+        'Missing gcp.client.service attribute'
+      );
+
+      assert.equal(
+        span.attributes['gcp.client.version'],
+        TRACER_VERSION,
+        'Missing gcp.client.version attribute'
+      );
+
+      assert.equal(
+        span.attributes['gcp.client.repo'],
+        'googleapis/nodejs-spanner',
+        'Missing gcp.client.repo attribute'
+      );
+
       assert.equal(
         span.attributes[SEMATTRS_DB_SYSTEM],
         'spanner',

src/instrument.ts

@@ -144,6 +144,9 @@ export function startTrace<T>(
       span.setAttribute(SEMATTRS_DB_SYSTEM, 'spanner');
       span.setAttribute(ATTR_OTEL_SCOPE_NAME, TRACER_NAME);
       span.setAttribute(ATTR_OTEL_SCOPE_VERSION, TRACER_VERSION);
+      span.setAttribute('gcp.client.service', 'spanner');
+      span.setAttribute('gcp.client.version', TRACER_VERSION);
+      span.setAttribute('gcp.client.repo', 'googleapis/nodejs-spanner');
 
       if (config.tableName) {
         span.setAttribute(SEMATTRS_DB_SQL_TABLE, config.tableName);