fix(services): считать failover по DNS-пулу а не по статусу ноды

Красный инцидент только если адреса нет в active_addresses, даже при unhealthy.

Co-authored-by: Cursor <[email protected]>

apps/web/src/lib/failover-events.test.ts

@@ -20,34 +20,72 @@ function node(
 }
 
 describe('toFailoverEvents', () => {
-  it('оставляет только unhealthy / down / checking', () => {
+  it('не считает healthy failover-событием', () => {
+    expect(isFailoverEventStatus('healthy')).toBe(false)
+    expect(isFailoverEventStatus('unhealthy')).toBe(true)
+  })
+
+  it('без DNS-пула ничего не показывает — нельзя врать про вывод', () => {
     const events = toFailoverEvents([
-      node({ address: '10.0.0.1', health_status: 'healthy' }),
       node({
         address: '130.49.213.153',
         health_status: 'unhealthy',
         consecutive_failures: 9,
         last_failure_reason: 'fetch failed',
-        last_check_at: '2026-08-20 07:00:00',
       }),
-      node({ address: '10.0.0.3', health_status: 'checking' }),
-      node({ address: '10.0.0.4', health_status: 'disabled' }),
     ])
-
-    expect(events.map((event) => event.address)).toEqual([
-      '130.49.213.153',
-      '10.0.0.3',
-    ])
-    expect(events[0]).toMatchObject({
-      consecutiveFailures: 9,
-      lastFailureReason: 'fetch failed',
-      lastCheckAt: '2026-08-20 07:00:00',
-      status: 'unhealthy',
-    })
+    expect(events).toEqual([])
   })
 
-  it('не считает healthy failover-событием', () => {
-    expect(isFailoverEventStatus('healthy')).toBe(false)
-    expect(isFailoverEventStatus('unhealthy')).toBe(true)
+  it('нездоровый адрес в DNS-пуле не инцидент (last-resort / ещё в A-записи)', () => {
+    const events = toFailoverEvents(
+      [
+        node({
+          address: '130.49.213.153',
+          health_status: 'unhealthy',
+          consecutive_failures: 9,
+          last_failure_reason: 'fetch failed',
+        }),
+        node({ address: '10.0.0.3', health_status: 'checking' }),
+      ],
+      ['130.49.213.153', '10.0.0.2'],
+    )
+    expect(events.map((event) => event.address)).toEqual(['10.0.0.3'])
+  })
+
+  it('здоровый standby вне пула не инцидент', () => {
+    const events = toFailoverEvents(
+      [
+        node({ address: '10.0.0.1', health_status: 'healthy' }),
+        node({ address: '10.0.0.2', health_status: 'healthy' }),
+      ],
+      ['10.0.0.1'],
+    )
+    expect(events).toEqual([])
+  })
+
+  it('нездоровый адрес без A-записи — реальный вывод из пула', () => {
+    const events = toFailoverEvents(
+      [
+        node({
+          address: '130.49.213.153',
+          health_status: 'unhealthy',
+          consecutive_failures: 9,
+          last_failure_reason: 'fetch failed',
+          last_check_at: '2026-08-20 07:00:00',
+        }),
+      ],
+      ['10.0.0.1'],
+    )
+    expect(events).toEqual([
+      {
+        id: '130.49.213.153',
+        address: '130.49.213.153',
+        status: 'unhealthy',
+        consecutiveFailures: 9,
+        lastFailureReason: 'fetch failed',
+        lastCheckAt: '2026-08-20 07:00:00',
+      },
+    ])
   })
 })

apps/web/src/lib/failover-events.ts

@@ -22,15 +22,25 @@ export function isFailoverEventStatus(status: string): boolean {
   return FAILOVER_STATUSES.has(status)
 }
 
+/**
+ * Инцидент failover = нездоровый адрес, которого нет в DNS-пуле.
+ * Нода в activeAddresses (в т.ч. last-resort) — не «выведена».
+ */
 export function toFailoverEvents(
   nodes: readonly FailoverNodeInput[],
+  activeAddresses: readonly string[] = [],
 ): FailoverEvent[] {
-  return nodes.filter((node) => isFailoverEventStatus(node.health_status)).map((node) => ({
-    id: String(node.id ?? node.address),
-    address: node.address,
-    status: node.health_status,
-    consecutiveFailures: node.consecutive_failures,
-    lastFailureReason: node.last_failure_reason,
-    lastCheckAt: node.last_check_at ?? null,
-  }))
+  const pool = new Set(activeAddresses)
+  if (pool.size === 0) return []
+
+  return nodes
+    .filter((node) => isFailoverEventStatus(node.health_status) && !pool.has(node.address))
+    .map((node) => ({
+      id: String(node.id ?? node.address),
+      address: node.address,
+      status: node.health_status,
+      consecutiveFailures: node.consecutive_failures,
+      lastFailureReason: node.last_failure_reason,
+      lastCheckAt: node.last_check_at ?? null,
+    }))
 }