Logging: reduce verbosity (#9107)

Author: humitos

readthedocs/doc_builder/environments.py

@@ -646,7 +646,10 @@ def __exit__(self, exc_type, exc_value, tb):
                 container_id=self.container_id,
             )
         except DockerAPIError:
-            log.exception(
+            # Logging this as warning because it usually happens due memory
+            # limit or build timeout. In those cases, the container is not
+            # running and can't be killed
+            log.warning(
                 'Unable to kill container.',
                 container_id=self.container_id,
             )

readthedocs/projects/tasks/builds.py

@@ -136,7 +136,6 @@ def on_failure(self, exc, task_id, args, kwargs, einfo):
         if isinstance(exc, RepositoryError):
             log.warning(
                 'There was an error with the repository.',
-                exc_info=True,
             )
         elif isinstance(exc, SyncRepositoryLocked):
             log.warning(