fix: PAAL-206 add excluded urls env var to starlette app

Author: qa-jil-kamerling

adk/agenticlayer/agent_to_a2a.py

@@ -4,12 +4,17 @@
 """
 
 import logging
+import os
+
+from a2a.utils.constants import AGENT_CARD_WELL_KNOWN_PATH
+
+# Needs to be set here since _excluded_urls is initialized at module import time
+os.environ.setdefault("OTEL_PYTHON_STARLETTE_EXCLUDED_URLS", AGENT_CARD_WELL_KNOWN_PATH)
 
 from a2a.server.apps import A2AStarletteApplication
 from a2a.server.request_handlers import DefaultRequestHandler
 from a2a.server.tasks import InMemoryTaskStore
 from a2a.types import AgentCapabilities, AgentCard
-from a2a.utils.constants import AGENT_CARD_WELL_KNOWN_PATH
 from google.adk.a2a.executor.a2a_agent_executor import A2aAgentExecutor
 from google.adk.agents.base_agent import BaseAgent
 from google.adk.apps.app import App