fix(unraid): use metrics.memory utilization for RAM widget values

The health monitoring widget computed total memory from info.memory.layout[].size
and derived used memory from percentTotal. On some Unraid versions the layout size
is reported in KiB, causing the RAM value to be ~1024x too small (0.01 GiB instead
of ~12 GiB) while the percentage ring stayed correct.

Use metrics.memory.total and metrics.memory.available (documented as bytes) with
used = total - available, matching Unraid's own percentTotal calculation. Removes
the now-unused info.memory.layout query and schema field and adds regression tests.

packages/integrations/src/unraid/test/unraid-integration.spec.ts

@@ -0,0 +1,150 @@
+// @vitest-environment node
+
+import { Response } from "undici";
+import { beforeEach, describe, expect, test, vi } from "vitest";
+
+vi.hoisted(() => {
+  process.env.CI = "true";
+  process.env.NODE_ENV = "test";
+  process.env.SECRET_ENCRYPTION_KEY = "0".repeat(64);
+});
+
+vi.mock("@homarr/core/infrastructure/http", () => ({
+  fetchWithTrustedCertificatesAsync: vi.fn(),
+}));
+
+vi.mock("@homarr/core/infrastructure/logs", () => ({
+  createLogger: () => ({
+    debug: vi.fn(),
+    info: vi.fn(),
+    warn: vi.fn(),
+    error: vi.fn(),
+  }),
+}));
+
+import { fetchWithTrustedCertificatesAsync } from "@homarr/core/infrastructure/http";
+
+import type { IntegrationSecret } from "../../base/types";
+import { UnraidIntegration } from "../unraid-integration";
+
+const TEST_URL = "https://unraid.example.com";
+const mockFetch = vi.mocked(fetchWithTrustedCertificatesAsync);
+
+const createIntegration = (secrets: IntegrationSecret[] = []) =>
+  new UnraidIntegration({
+    id: "test-unraid",
+    name: "Test Unraid",
+    url: TEST_URL,
+    externalUrl: null,
+    decryptedSecrets: secrets.length ? secrets : [{ kind: "apiKey", value: "secret-api-key" }],
+  });
+
+const graphqlResponse = (data: unknown) => ({
+  data,
+});
+
+const mockGraphQL = (data: unknown) => {
+  mockFetch.mockResolvedValue(
+    new Response(JSON.stringify(graphqlResponse(data)), {
+      status: 200,
+      headers: { "content-type": "application/json" },
+    }),
+  );
+};
+
+const GiB = 1024 * 1024 * 1024;
+
+const systemInfoResponse = {
+  metrics: {
+    cpu: {
+      percentTotal: 10,
+      cpus: [{ percentTotal: 10 }, { percentTotal: 10 }],
+    },
+    memory: {
+      available: 20 * GiB,
+      used: 12 * GiB,
+      free: 10 * GiB,
+      total: 32 * GiB,
+      percentTotal: 37.5,
+    },
+  },
+  array: {
+    state: "STARTED",
+    capacity: {
+      disks: {
+        free: 100,
+        total: 200,
+        used: 100,
+      },
+    },
+    disks: [
+      {
+        name: "disk1",
+        size: 200 * 1024 * 1024,
+        fsFree: 100 * 1024 * 1024,
+        fsUsed: 100 * 1024 * 1024,
+        status: "DISK_OK",
+        temp: 38,
+      },
+    ],
+  },
+  info: {
+    devices: {
+      network: [
+        {
+          speed: 1000,
+          dhcp: true,
+          model: "eth0",
+        },
+      ],
+    },
+    os: {
+      platform: "linux",
+      distro: "Unraid",
+      release: "7.3.2",
+      uptime: new Date().toISOString(),
+    },
+    cpu: {
+      manufacturer: "Intel",
+      brand: "Intel Core i5",
+      cores: 4,
+      threads: 8,
+    },
+  },
+};
+
+describe("UnraidIntegration", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  test("computes used memory from metrics.memory.total - available instead of layout sizes", async () => {
+    mockGraphQL(systemInfoResponse);
+    const integration = createIntegration();
+
+    const result = await integration.getSystemInfoAsync();
+
+    expect(result.memUsedInBytes).toBe(12 * GiB);
+    expect(result.memAvailableInBytes).toBe(20 * GiB);
+  });
+
+  test("never reports negative used memory when available exceeds total", async () => {
+    mockGraphQL({
+      ...systemInfoResponse,
+      metrics: {
+        ...systemInfoResponse.metrics,
+        memory: {
+          ...systemInfoResponse.metrics.memory,
+          available: 40 * GiB,
+          total: 32 * GiB,
+        },
+      },
+    });
+    const integration = createIntegration();
+
+    const result = await integration.getSystemInfoAsync();
+
+    expect(result.memUsedInBytes).toBe(0);
+    expect(result.memAvailableInBytes).toBe(32 * GiB);
+  });
+});

packages/integrations/src/unraid/unraid-integration.ts

@@ -47,8 +47,12 @@ export class UnraidIntegration extends Integration implements ISystemHealthMonit
       cpuUtilizationNormalized = cpuUtilization / cpuCount;
     }
 
-    const totalMemory = systemInfo.info.memory.layout.reduce((acc, layout) => layout.size + acc, 0);
-    const usedMemory = totalMemory * (systemInfo.metrics.memory.percentTotal / 100);
+    // metrics.memory.* is documented as bytes (see MemoryUtilization schema), unlike
+    // info.memory.layout[].size, which can be reported in KiB on some Unraid versions and caused a
+    // 1024x under-reporting of used RAM. total - available matches Unraid's percentTotal calculation.
+
+    const totalMemory = systemInfo.metrics.memory.total;
+    const usedMemory = Math.max(totalMemory - systemInfo.metrics.memory.available, 0);
     const uptime = dayjs(systemInfo.info.os.uptime);
 
     return {
@@ -143,11 +147,6 @@ export class UnraidIntegration extends Integration implements ISystemHealthMonit
             brand,
             cores,
             threads
-          },
-          memory {
-            layout {
-              size
-            }
           }
         }
       }

packages/integrations/src/unraid/unraid-types.ts

@@ -60,13 +60,6 @@ export const unraidSystemInfoSchema = z.object({
       cores: z.number(),
       threads: z.number(),
     }),
-    memory: z.object({
-      layout: z.array(
-        z.object({
-          size: z.number(),
-        }),
-      ),
-    }),
   }),
 });