Allow for custom timeout in watch request

kopf/clients/watching.py

@@ -201,7 +201,7 @@ async def watch_objs(
     # Talk to the API and initiate a streaming response.
     response = await context.session.get(
         url=resource.get_url(server=context.server, namespace=namespace, params=params),
-        timeout=aiohttp.ClientTimeout(total=None),
+        timeout=aiohttp.ClientTimeout(total=config.WatchersConfig.session_timeout),
     )
     response.raise_for_status()
 

kopf/config.py

@@ -121,3 +121,6 @@ class WatchersConfig:
 
     watcher_retry_delay: float = 0.1
     """ How long should a pause be between watch requests (to prevent flooding). """
+
+    session_timeout: Optional[float] = None
+    """ The http session timeout to use in watch request. """