fix(services): снимать Down только с общего FQDN

Персональные A не крутить и не трогать при падении. Панель называется по режиму балансировки.

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

apps/api/test/lb-reconcile.test.ts

@@ -1,6 +1,8 @@
 import { describe, expect, it } from "vitest";
 import {
+  resolveDesiredAIps,
   selectActiveIpsByMode,
+  shouldRecordFailoverDnsDiff,
   type LbIpRow,
   type LbTargetConfig,
 } from "../src/services/service-config-service.js";
@@ -144,3 +146,75 @@ describe("selectActiveIpsByMode", () => {
     expect(selectActiveIpsByMode(config, [])).toEqual([]);
   });
 });
+
+describe("resolveDesiredAIps", () => {
+  it("keeps a dedicated single IP even when down", () => {
+    expect(
+      resolveDesiredAIps(
+        weightedConfig,
+        [row("1.1.1.1", { health: "down" })],
+        ["1.1.1.1"],
+      ),
+    ).toEqual(["1.1.1.1"]);
+  });
+
+  it("applies weighted overlay on a shared pool", () => {
+    const rows = [
+      row("1.1.1.1", { weight: 1, health: "up" }),
+      row("2.2.2.2", { weight: 3, health: "up" }),
+    ];
+    expect(
+      resolveDesiredAIps(weightedConfig, rows, ["1.1.1.1", "2.2.2.2"], 0),
+    ).toEqual(selectActiveIpsByMode(weightedConfig, rows, 0));
+  });
+});
+
+describe("shouldRecordFailoverDnsDiff", () => {
+  it("skips dedicated extra-FQDN", () => {
+    expect(
+      shouldRecordFailoverDnsDiff({
+        configuredIps: ["1.1.1.1"],
+        lbMode: "failover",
+        added: [],
+        removed: ["1.1.1.1"],
+        downIps: new Set(["1.1.1.1"]),
+      }),
+    ).toBe(false);
+  });
+
+  it("skips weighted live-to-live slot swap", () => {
+    expect(
+      shouldRecordFailoverDnsDiff({
+        configuredIps: ["1.1.1.1", "2.2.2.2"],
+        lbMode: "weighted",
+        added: ["2.2.2.2"],
+        removed: ["1.1.1.1"],
+        downIps: new Set(),
+      }),
+    ).toBe(false);
+  });
+
+  it("logs weighted swap when a down ip leaves the pool", () => {
+    expect(
+      shouldRecordFailoverDnsDiff({
+        configuredIps: ["1.1.1.1", "2.2.2.2"],
+        lbMode: "weighted",
+        added: ["2.2.2.2"],
+        removed: ["1.1.1.1"],
+        downIps: new Set(["1.1.1.1"]),
+      }),
+    ).toBe(true);
+  });
+
+  it("logs failover diffs on a shared pool", () => {
+    expect(
+      shouldRecordFailoverDnsDiff({
+        configuredIps: ["1.1.1.1", "2.2.2.2"],
+        lbMode: "failover",
+        added: ["2.2.2.2"],
+        removed: ["1.1.1.1"],
+        downIps: new Set(["1.1.1.1"]),
+      }),
+    ).toBe(true);
+  });
+});