link watcher switch to event based instead of polling

frontend/src/pages/Network.tsx

@@ -284,11 +284,11 @@ export default function Network() {
 
   function openEnableWatcherModal(bridgeName: string) {
     setWatcherBridgeName(bridgeName);
-    watcherForm.setFieldsValue({ poll_interval_seconds: 0.25 });
+    watcherForm.setFieldsValue({ recovery_holdoff_seconds: 1.0 });
     setWatcherModalVisible(true);
   }
 
-  function handleEnableWatcher(values: { poll_interval_seconds: number }) {
+  function handleEnableWatcher(values: { recovery_holdoff_seconds: number }) {
     if (!watcherBridgeName) {
       return;
     }
@@ -434,8 +434,9 @@ export default function Network() {
                     >
                       <Descriptions size="small" column={4} style={{ marginBottom: members.length ? 12 : 0 }}>
                         <Descriptions.Item label="Members">{bridge.members.map((member) => member.ifname).join(', ') || '—'}</Descriptions.Item>
-                        <Descriptions.Item label="Poll interval">
-                          {watcher?.poll_interval_seconds ? `${watcher.poll_interval_seconds}s` : '—'}
+                        <Descriptions.Item label="Mode">{watcher?.event_driven ? 'netlink events' : '—'}</Descriptions.Item>
+                        <Descriptions.Item label="Recovery holdoff">
+                          {watcher?.recovery_holdoff_seconds ? `${watcher.recovery_holdoff_seconds}s` : '—'}
                         </Descriptions.Item>
                         <Descriptions.Item label="Suppressed">
                           {watcher?.suppressed_members.length ? watcher.suppressed_members.join(', ') : 'none'}
@@ -501,16 +502,21 @@ export default function Network() {
         }}
         onOk={() => watcherForm.submit()}
       >
-        <Form form={watcherForm} layout="vertical" onFinish={handleEnableWatcher} initialValues={{ poll_interval_seconds: 0.25 }}>
+        <Form
+          form={watcherForm}
+          layout="vertical"
+          onFinish={handleEnableWatcher}
+          initialValues={{ recovery_holdoff_seconds: 1.0 }}
+        >
           <Form.Item
-            name="poll_interval_seconds"
-            label="Poll interval (seconds)"
-            rules={[{ required: true, message: 'Please provide a poll interval' }]}
+            name="recovery_holdoff_seconds"
+            label="Recovery holdoff (seconds)"
+            rules={[{ required: true, message: 'Please provide a recovery holdoff' }]}
           >
             <InputNumber min={0.05} max={10} step={0.05} precision={2} style={{ width: '100%' }} />
           </Form.Item>
           <Paragraph type="secondary" style={{ marginBottom: 0 }}>
-            When enabled, the backend suppresses sibling bridge ports if one member loses link and restores them after recovery.
+            The backend reacts to kernel link events and waits for this holdoff before restoring sibling ports after recovery.
           </Paragraph>
         </Form>
       </Modal>

frontend/src/types/network.ts

@@ -52,7 +52,7 @@ export interface BridgeRemoveRequest {
 }
 
 export interface BridgeLinkStateEnableRequest {
-  poll_interval_seconds: number;
+  recovery_holdoff_seconds: number;
 }
 
 export interface BridgeMemberLinkStateInfo {
@@ -67,11 +67,12 @@ export interface BridgeMemberLinkStateInfo {
 export interface BridgeLinkStateWatcherStatus {
   bridge: string;
   active: boolean;
-  poll_interval_seconds?: number | null;
-  last_poll_ts?: number | null;
+  event_driven?: boolean | null;
+  last_event_ts?: number | null;
   last_error?: string | null;
   last_action?: string | null;
   suppressed_members: string[];
+  recovery_holdoff_seconds?: number | null;
   members: Record<string, BridgeMemberLinkStateInfo>;
   message?: string | null;
 }