Add polling to LetPot coordinator (#146823)

- Adds polling (update_interval) to the coordinator for the LetPot integration. Push remains the primary update mechanism for all entities, but:
   - Polling makes entities go unavailable when the device can't be reached, which otherwise won't happen.
   - Pump changes do not always trigger a status push by the device (not sure why), polling makes the integration catch up to reality.

homeassistant/components/letpot/coordinator.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import asyncio
+from datetime import timedelta
 import logging
 
 from letpot.deviceclient import LetPotDeviceClient
@@ -42,6 +43,7 @@ class LetPotDeviceCoordinator(DataUpdateCoordinator[LetPotDeviceStatus]):
             _LOGGER,
             config_entry=config_entry,
             name=f"LetPot {device.serial_number}",
+            update_interval=timedelta(minutes=10),
         )
         self._info = info
         self.device = device

homeassistant/components/letpot/quality_scale.yaml

@@ -5,9 +5,9 @@ rules:
     comment: |
       This integration does not provide additional actions.
   appropriate-polling:
-    status: exempt
+    status: done
     comment: |
-      This integration only receives push-based updates.
+      Primarily uses push, but polls with a long interval for availability and missed updates.
   brands: done
   common-modules: done
   config-flow-test-coverage: done
@@ -39,7 +39,7 @@ rules:
     comment: |
       The integration does not have configuration options.
   docs-installation-parameters: done
-  entity-unavailable: todo
+  entity-unavailable: done
   integration-owner: done
   log-when-unavailable: todo
   parallel-updates: done