chore: Use lazy % formatting in logging functions to fix pylint warnings

PiperOrigin-RevId: 802639682

src/google/adk/cli/cli_eval.py

@@ -329,7 +329,7 @@ async def run_evals(
       except Exception:
         # Catching the general exception, so that we don't block other eval
         # cases.
-        logger.exception(f"Eval failed for `{eval_set_id}:{eval_name}`")
+        logger.exception("Eval failed for `%s:%s`", eval_set_id, eval_name)
 
 
 def _get_evaluator(eval_metric: EvalMetric) -> Evaluator:

src/google/adk/flows/llm_flows/base_llm_flow.py

@@ -210,11 +210,11 @@ class BaseLlmFlow(ABC):
       except (ConnectionClosed, ConnectionClosedOK) as e:
         # when the session timeout, it will just close and not throw exception.
         # so this is for bad cases
-        logger.error(f'Connection closed: {e}.')
+        logger.error('Connection closed: %s.', e)
         raise
       except Exception as e:
         logger.error(
-            f'An unexpected error occurred in live flow: {e}', exc_info=True
+            'An unexpected error occurred in live flow: %s', e, exc_info=True
         )
         raise
 

src/google/adk/sessions/database_session_service.py

@@ -411,7 +411,7 @@ class DatabaseSessionService(BaseSessionService):
 
     # Get the local timezone
     local_timezone = get_localzone()
-    logger.info(f"Local timezone: {local_timezone}")
+    logger.info("Local timezone: %s", local_timezone)
 
     self.db_engine: Engine = db_engine
     self.metadata: MetaData = MetaData()

src/google/adk/sessions/vertex_ai_session_service.py

@@ -130,7 +130,7 @@ class VertexAiSessionService(BaseSessionService):
               reasoning_engine_id, session_id, api_client
           )
         except ClientError:
-          logger.info(f'Polling session resource')
+          logger.info('Polling session resource')
           return None
 
       try:
@@ -320,7 +320,7 @@ class VertexAiSessionService(BaseSessionService):
           request_dict={},
       )
     except Exception as e:
-      logger.error(f'Error deleting session {session_id}: {e}')
+      logger.error('Error deleting session %s: %s', session_id, e)
       raise e
 
   @override