chore: add cloud.platform attribute to OTel resource

This applies to ADK Apps on Agent Engine and follows open-telemetry/semantic-conventions#2957.

PiperOrigin-RevId: 826021290

Author: vertex-sdk-bot

tests/unit/vertex_adk/test_agent_engine_templates_adk.py

@@ -666,6 +666,7 @@ def test_tracing_setup(
             "telemetry.sdk.version": "1.36.0",
             "gcp.project_id": "test-project",
             "cloud.account.id": "test-project",
+            "cloud.platform": "gcp.agent_engine",
             "service.name": "test_agent_id",
             "cloud.resource_id": "//aiplatform.googleapis.com/projects/test-project/locations/us-central1/reasoningEngines/test_agent_id",
             "service.instance.id": "12345678123456781234567812345678-123123123",

tests/unit/vertex_adk/test_reasoning_engine_templates_adk.py

@@ -636,6 +636,7 @@ def test_tracing_setup(
             "telemetry.sdk.version": "1.36.0",
             "gcp.project_id": "test-project",
             "cloud.account.id": "test-project",
+            "cloud.platform": "gcp.agent_engine",
             "service.name": "test_agent_id",
             "cloud.resource_id": "//aiplatform.googleapis.com/projects/test-project/locations/us-central1/reasoningEngines/test_agent_id",
             "service.instance.id": "12345678123456781234567812345678-123123123",

vertexai/agent_engines/templates/adk.py

@@ -320,6 +320,7 @@ def _detect_cloud_resource_id(project_id: str) -> Optional[str]:
         attributes={
             "gcp.project_id": project_id,
             "cloud.account.id": project_id,
+            "cloud.platform": "gcp.agent_engine",
             "service.name": os.getenv("GOOGLE_CLOUD_AGENT_ENGINE_ID", ""),
             "service.instance.id": f"{uuid.uuid4().hex}-{os.getpid()}",
             "cloud.region": os.getenv("GOOGLE_CLOUD_LOCATION", ""),

vertexai/preview/reasoning_engines/templates/adk.py

@@ -300,6 +300,7 @@ def _detect_cloud_resource_id(project_id: str) -> Optional[str]:
         attributes={
             "gcp.project_id": project_id,
             "cloud.account.id": project_id,
+            "cloud.platform": "gcp.agent_engine",
             "service.name": os.getenv("GOOGLE_CLOUD_AGENT_ENGINE_ID", ""),
             "service.instance.id": f"{uuid.uuid4().hex}-{os.getpid()}",
             "cloud.region": os.getenv("GOOGLE_CLOUD_LOCATION", ""),