better transient state handling

backend/src/utilities/bridge_link_state_manager.py

@@ -268,8 +268,11 @@ class BridgeLinkStateWatcher:
             for ifname in states
             if self._config_changed(ifname, states, previous_states)
         )
-        if changed_members:
-            self._mark_config_changes(changed_members, now)
+        transition_seeds: list[str] = list(changed_members)
+        if reason == "netlink_event" and source_ifname is not None and source_ifname in states:
+            transition_seeds.append(source_ifname)
+        if transition_seeds:
+            self._mark_config_changes(transition_seeds, now)
 
         if failing_members:
             config_source = self._find_config_sync_source(states, previous_states, preferred_ifname=source_ifname)
@@ -476,8 +479,9 @@ class BridgeLinkStateWatcher:
     def _mark_config_changes(self, ifnames: list[str], now: float) -> None:
         """Keep short-lived link flaps from config changes from being treated as failures."""
         holdoff = max(
-            settings.bridge_link_state_failure_holdoff_seconds,
-            self.recovery_holdoff_seconds,
+            settings.bridge_link_state_failure_holdoff_seconds * 2,
+            self.recovery_holdoff_seconds * 2,
+            1.5,
         )
         with self._lock:
             for ifname in ifnames: