diff --git a/apps/gittensory-ui/src/lib/selfhost-env-reference.ts b/apps/gittensory-ui/src/lib/selfhost-env-reference.ts
index b8944dcb4f..35099dbd13 100644
--- a/apps/gittensory-ui/src/lib/selfhost-env-reference.ts
+++ b/apps/gittensory-ui/src/lib/selfhost-env-reference.ts
@@ -15,11 +15,11 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "AI_EMBED_API_KEY",
-    firstReference: "src/server.ts:441",
+    firstReference: "src/server.ts:443",
   },
   {
     name: "AI_EMBED_BASE_URL",
-    firstReference: "src/server.ts:438",
+    firstReference: "src/server.ts:440",
   },
   {
     name: "AI_EMBED_MODEL",
@@ -47,7 +47,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "BACKUP_ACKNOWLEDGED",
-    firstReference: "src/server.ts:380",
+    firstReference: "src/server.ts:381",
   },
   {
     name: "BROWSER_WS_ENDPOINT",
@@ -87,11 +87,11 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "CRON_INTERVAL_MS",
-    firstReference: "src/server.ts:919",
+    firstReference: "src/server.ts:922",
   },
   {
     name: "DATABASE_PATH",
-    firstReference: "src/server.ts:250",
+    firstReference: "src/server.ts:251",
   },
   {
     name: "DATABASE_URL",
@@ -131,7 +131,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "GITHUB_CACHE_TTL_SECONDS",
-    firstReference: "src/server.ts:510",
+    firstReference: "src/server.ts:512",
   },
   {
     name: "GITHUB_INSTALLATION_CONCURRENCY_DEFER_MS",
@@ -147,7 +147,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "GITTENSORY_REPO_CONFIG_DIR",
-    firstReference: "src/server.ts:289",
+    firstReference: "src/server.ts:290",
   },
   {
     name: "GITTENSORY_VERSION",
@@ -191,7 +191,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "MIGRATIONS_DIR",
-    firstReference: "src/server.ts:393",
+    firstReference: "src/server.ts:395",
   },
   {
     name: "OBSERVABILITY_SMOKE_POLL_MS",
@@ -251,7 +251,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "ORB_BROKER_URL",
-    firstReference: "src/server.ts:974",
+    firstReference: "src/server.ts:977",
   },
   {
     name: "ORB_COLLECTOR_TOKEN",
@@ -267,7 +267,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "ORB_RELAY_MODE",
-    firstReference: "src/server.ts:962",
+    firstReference: "src/server.ts:965",
   },
   {
     name: "OTEL_EXPORTER_OTLP_ENDPOINT",
@@ -303,11 +303,11 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "PGVECTOR_ENABLED",
-    firstReference: "src/server.ts:230",
+    firstReference: "src/server.ts:231",
   },
   {
     name: "PORT",
-    firstReference: "src/server.ts:718",
+    firstReference: "src/server.ts:721",
   },
   {
     name: "PUBLIC_API_ORIGIN",
@@ -323,7 +323,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "QDRANT_URL",
-    firstReference: "src/server.ts:529",
+    firstReference: "src/server.ts:531",
   },
   {
     name: "QUEUE_BACKGROUND_CONCURRENCY",
@@ -347,7 +347,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "REVIEW_AUDIT_DIR",
-    firstReference: "src/server.ts:574",
+    firstReference: "src/server.ts:576",
   },
   {
     name: "SELFHOST_BUNDLE_ALL",
@@ -383,7 +383,7 @@ export const SELFHOST_ENV_REFERENCE_ROWS: SelfHostEnvReferenceRow[] = [
   },
   {
     name: "SETUP_OUTPUT_PATH",
-    firstReference: "src/server.ts:835",
+    firstReference: "src/server.ts:838",
   },
   {
     name: "SLACK_WEBHOOK_URL",
@@ -396,15 +396,15 @@ export const SELFHOST_ENV_REFERENCE_MARKDOWN = [
   "| --- | --- |",
   "| `AI_COMBINE` | `src/selfhost/ai.ts:1160` |",
   "| `AI_DUAL_REVIEW` | `src/selfhost/ai.ts:1135` |",
-  "| `AI_EMBED_API_KEY` | `src/server.ts:441` |",
-  "| `AI_EMBED_BASE_URL` | `src/server.ts:438` |",
+  "| `AI_EMBED_API_KEY` | `src/server.ts:443` |",
+  "| `AI_EMBED_BASE_URL` | `src/server.ts:440` |",
   "| `AI_EMBED_MODEL` | `src/selfhost/ai.ts:1032` |",
   "| `AI_ON_MERGE` | `src/selfhost/ai.ts:1162` |",
   "| `AI_PROVIDER` | `src/selfhost/ai-config.ts:43` |",
   "| `ANTHROPIC_AI_BASE_URL` | `src/selfhost/ai.ts:1036` |",
   "| `ANTHROPIC_AI_MODEL` | `src/selfhost/ai.ts:96` |",
   "| `ANTHROPIC_API_KEY` | `src/selfhost/ai.ts:1035` |",
-  "| `BACKUP_ACKNOWLEDGED` | `src/server.ts:380` |",
+  "| `BACKUP_ACKNOWLEDGED` | `src/server.ts:381` |",
   "| `BROWSER_WS_ENDPOINT` | `src/selfhost/stubs/puppeteer.ts:11` |",
   "| `CLAUDE_AI_EFFORT` | `src/selfhost/ai.ts:147` |",
   "| `CLAUDE_AI_MODEL` | `src/selfhost/ai.ts:88` |",
@@ -414,8 +414,8 @@ export const SELFHOST_ENV_REFERENCE_MARKDOWN = [
   "| `CODEX_AI_MODEL` | `src/selfhost/ai.ts:92` |",
   "| `CODEX_AI_TIMEOUT_MS` | `src/selfhost/ai.ts:151` |",
   "| `CODEX_HOME` | `src/selfhost/ai.ts:340` |",
-  "| `CRON_INTERVAL_MS` | `src/server.ts:919` |",
-  "| `DATABASE_PATH` | `src/server.ts:250` |",
+  "| `CRON_INTERVAL_MS` | `src/server.ts:922` |",
+  "| `DATABASE_PATH` | `src/server.ts:251` |",
   "| `DATABASE_URL` | `src/selfhost/preflight.ts:201` |",
   "| `DISCORD_REPO_WEBHOOKS` | `src/services/notify-discord.ts:41` |",
   "| `DISCORD_WEBHOOK_URL` | `src/services/notify-discord.ts:78` |",
@@ -425,11 +425,11 @@ export const SELFHOST_ENV_REFERENCE_MARKDOWN = [
   "| `FOREGROUND_LIVENESS_MAX_RELEASE_PER_SWEEP` | `src/selfhost/foreground-liveness.ts:53` |",
   "| `GITHUB_APP_ID` | `src/selfhost/orb-collector.ts:59` |",
   "| `GITHUB_APP_PRIVATE_KEY` | `src/selfhost/orb-collector.ts:166` |",
-  "| `GITHUB_CACHE_TTL_SECONDS` | `src/server.ts:510` |",
+  "| `GITHUB_CACHE_TTL_SECONDS` | `src/server.ts:512` |",
   "| `GITHUB_INSTALLATION_CONCURRENCY_DEFER_MS` | `src/selfhost/installation-concurrency-admission.ts:47` |",
   "| `GITHUB_INSTALLATION_CONCURRENCY_ENABLED` | `src/selfhost/installation-concurrency-admission.ts:34` |",
   "| `GITHUB_INSTALLATION_CONCURRENCY_LIMIT` | `src/selfhost/installation-concurrency-admission.ts:43` |",
-  "| `GITTENSORY_REPO_CONFIG_DIR` | `src/server.ts:289` |",
+  "| `GITTENSORY_REPO_CONFIG_DIR` | `src/server.ts:290` |",
   "| `GITTENSORY_VERSION` | `src/selfhost/otel.ts:62` |",
   "| `HOME` | `src/selfhost/ai.ts:340` |",
   "| `MAINTENANCE_ADMISSION_DEFER_MS` | `src/selfhost/maintenance-admission.ts:171` |",
@@ -440,7 +440,7 @@ export const SELFHOST_ENV_REFERENCE_MARKDOWN = [
   "| `MAINTENANCE_ADMISSION_MAX_LIVE_AGE_MS` | `src/selfhost/maintenance-admission.ts:155` |",
   "| `MAINTENANCE_ADMISSION_MAX_LIVE_PENDING` | `src/selfhost/maintenance-admission.ts:151` |",
   "| `MAINTENANCE_ADMISSION_MAX_PENDING` | `src/selfhost/maintenance-admission.ts:159` |",
-  "| `MIGRATIONS_DIR` | `src/server.ts:393` |",
+  "| `MIGRATIONS_DIR` | `src/server.ts:395` |",
   "| `OBSERVABILITY_SMOKE_POLL_MS` | `scripts/smoke-observability-traces.mjs:8` |",
   "| `OBSERVABILITY_SMOKE_TIMEOUT_MS` | `scripts/smoke-observability-traces.mjs:6` |",
   "| `OLLAMA_AI_API_KEY` | `src/selfhost/ai.ts:1029` |",
@@ -455,11 +455,11 @@ export const SELFHOST_ENV_REFERENCE_MARKDOWN = [
   "| `ORB_AIR_GAP` | `src/selfhost/orb-collector.ts:161` |",
   "| `ORB_ANONYMIZE` | `src/selfhost/orb-collector.ts:174` |",
   "| `ORB_APP_ID` | `src/selfhost/orb-collector.ts:59` |",
-  "| `ORB_BROKER_URL` | `src/server.ts:974` |",
+  "| `ORB_BROKER_URL` | `src/server.ts:977` |",
   "| `ORB_COLLECTOR_TOKEN` | `src/selfhost/orb-collector.ts:205` |",
   "| `ORB_COLLECTOR_URL` | `src/selfhost/orb-collector.ts:172` |",
   "| `ORB_ENROLLMENT_SECRET` | `src/selfhost/orb-collector.ts:165` |",
-  "| `ORB_RELAY_MODE` | `src/server.ts:962` |",
+  "| `ORB_RELAY_MODE` | `src/server.ts:965` |",
   "| `OTEL_EXPORTER_OTLP_ENDPOINT` | `src/selfhost/otel.ts:47` |",
   "| `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT` | `src/selfhost/otel.ts:45` |",
   "| `OTEL_SERVICE_ENVIRONMENT` | `src/selfhost/otel.ts:60` |",
@@ -468,18 +468,18 @@ export const SELFHOST_ENV_REFERENCE_MARKDOWN = [
   "| `OTEL_TRACES_SAMPLER` | `src/selfhost/otel.ts:74` |",
   "| `OTEL_TRACES_SAMPLER_ARG` | `src/selfhost/otel.ts:76` |",
   "| `PGPOOL_MAX` | `src/selfhost/queue-common.ts:713` |",
-  "| `PGVECTOR_ENABLED` | `src/server.ts:230` |",
-  "| `PORT` | `src/server.ts:718` |",
+  "| `PGVECTOR_ENABLED` | `src/server.ts:231` |",
+  "| `PORT` | `src/server.ts:721` |",
   "| `PUBLIC_API_ORIGIN` | `src/selfhost/preflight.ts:192` |",
   "| `QDRANT_API_KEY` | `src/selfhost/qdrant-vectorize.ts:50` |",
   "| `QDRANT_DIM` | `src/selfhost/qdrant-vectorize.ts:71` |",
-  "| `QDRANT_URL` | `src/server.ts:529` |",
+  "| `QDRANT_URL` | `src/server.ts:531` |",
   "| `QUEUE_BACKGROUND_CONCURRENCY` | `src/selfhost/queue-common.ts:130` |",
   "| `QUEUE_CONCURRENCY` | `src/selfhost/pg-queue.ts:286` |",
   "| `QUEUE_DEAD_LETTER_AUTO_RETRY_MAX_EXTRA_ATTEMPTS` | `src/selfhost/queue-common.ts:721` |",
   "| `QUEUE_STARTUP_JITTER_MIN_JOBS` | `src/selfhost/queue-common.ts:702` |",
   "| `REDIS_URL` | `src/selfhost/preflight.ts:144` |",
-  "| `REVIEW_AUDIT_DIR` | `src/server.ts:574` |",
+  "| `REVIEW_AUDIT_DIR` | `src/server.ts:576` |",
   "| `SELFHOST_BUNDLE_ALL` | `scripts/build-selfhost.mjs:13` |",
   "| `SELFHOST_SERVICE` | `scripts/smoke-observability-traces.mjs:5` |",
   "| `SELFHOST_SETUP_TOKEN` | `src/selfhost/preflight.ts:186` |",
@@ -488,6 +488,6 @@ export const SELFHOST_ENV_REFERENCE_MARKDOWN = [
   "| `SENTRY_RELEASE` | `src/selfhost/otel.ts:62` |",
   "| `SENTRY_SERVER_NAME` | `src/selfhost/sentry.ts:407` |",
   "| `SENTRY_TRACES_SAMPLE_RATE` | `src/selfhost/sentry.ts:195` |",
-  "| `SETUP_OUTPUT_PATH` | `src/server.ts:835` |",
+  "| `SETUP_OUTPUT_PATH` | `src/server.ts:838` |",
   "| `SLACK_WEBHOOK_URL` | `src/services/notify-discord.ts:173` |",
 ].join("\n");
diff --git a/src/selfhost/health.ts b/src/selfhost/health.ts
index 265ae7de98..b02b6b7b8e 100644
--- a/src/selfhost/health.ts
+++ b/src/selfhost/health.ts
@@ -150,3 +150,8 @@ export function sqliteBackupAdvisory(opts: { usingSqlite: boolean; backupAcknowl
   if (!opts.usingSqlite || opts.backupAcknowledged) return null;
   return "Running on a single SQLite file with no acknowledged backup — if the volume is lost, ALL review state is lost. Enable the Litestream sidecar (see the maintainer self-hosting docs) to stream the WAL to S3/B2/MinIO, then set BACKUP_ACKNOWLEDGED=true to silence this warning. (Multi-instance: use DATABASE_URL=postgres://… instead.)";
 }
+
+/** Prometheus gauge value mirroring {@link sqliteBackupAdvisory}: 1 when Postgres or backup is acknowledged, 0 when the advisory would fire. */
+export function backupAcknowledgedGaugeValue(opts: { usingSqlite: boolean; backupAcknowledged: boolean }): 0 | 1 {
+  return sqliteBackupAdvisory(opts) === null ? 1 : 0;
+}
diff --git a/src/selfhost/metrics.ts b/src/selfhost/metrics.ts
index c6f21b78a0..5f84f09bee 100644
--- a/src/selfhost/metrics.ts
+++ b/src/selfhost/metrics.ts
@@ -52,6 +52,7 @@ const DEFAULT_METRIC_META: readonly (readonly [string, MetricMeta])[] = [
   ["gittensory_github_rest_rate_limit_remaining", { help: "Newest observed GitHub REST rate-limit remaining count, by key scope.", type: "gauge" }],
   ["gittensory_host_load_avg1_per_core", { help: "One-minute host load average normalized by CPU core count.", type: "gauge" }],
   ["gittensory_uptime_seconds", { help: "Self-host process uptime in seconds.", type: "gauge" }],
+  ["gittensory_backup_acknowledged", { help: "1 when SQLite backup is acknowledged or Postgres is in use; 0 when the boot backup advisory would fire.", type: "gauge" }],
   ["gittensory_http_requests_total", { help: "HTTP app requests by response status class.", type: "counter" }],
   ["gittensory_http_request_duration_seconds", { help: "HTTP app request duration in seconds.", type: "histogram" }],
   ["gittensory_webhook_dedup_total", { help: "Webhook deliveries deduplicated before enqueue.", type: "counter" }],
diff --git a/src/server.ts b/src/server.ts
index 789d4a104d..9f5a3018bb 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -43,6 +43,7 @@ import { createOrbRelayRegistrationState, isOrbBrokerMode, registerOrbRelayTarge
 import { exportOrbBatch } from "./selfhost/orb-collector";
 import { createD1Adapter, nodeSqliteDriver } from "./selfhost/d1-adapter";
 import {
+  backupAcknowledgedGaugeValue,
   buildHealthBody,
   codexAuthReadinessProbe,
   githubAppReadinessProbe,
@@ -375,10 +376,11 @@ async function main(): Promise<void> {
   );
   // Data-safety advisory (#8): warn LOUDLY at boot if running on a single SQLite file with no acknowledged backup,
   // so an operator doesn't run with zero durability while /ready answers 200.
-  const backupAdvisory = sqliteBackupAdvisory({
+  const sqliteBackupOpts = {
     usingSqlite: !usePostgres,
     backupAcknowledged: process.env.BACKUP_ACKNOWLEDGED === "true",
-  });
+  };
+  const backupAdvisory = sqliteBackupAdvisory(sqliteBackupOpts);
   if (backupAdvisory)
     console.warn(
       JSON.stringify({
@@ -688,6 +690,7 @@ async function main(): Promise<void> {
   gauge("gittensory_uptime_seconds", () =>
     Math.floor((Date.now() - startedAt) / 1000),
   );
+  gauge("gittensory_backup_acknowledged", () => backupAcknowledgedGaugeValue(sqliteBackupOpts));
   // Pre-initialize job counters to 0 so they appear in the first Prometheus scrape (lazy counters
   // created on first use would otherwise cause "No data" in Grafana until the first job event).
   for (const c of [
diff --git a/test/unit/selfhost-health.test.ts b/test/unit/selfhost-health.test.ts
index 65d93a0744..65a386a483 100644
--- a/test/unit/selfhost-health.test.ts
+++ b/test/unit/selfhost-health.test.ts
@@ -5,6 +5,7 @@ import { join } from "node:path";
 import { describe, expect, it, vi } from "vitest";
 import { createD1Adapter, nodeSqliteDriver } from "../../src/selfhost/d1-adapter";
 import {
+  backupAcknowledgedGaugeValue,
   buildHealthBody,
   codexAuthReadinessProbe,
   githubAppReadinessProbe,
@@ -210,6 +211,14 @@ describe("sqliteBackupAdvisory (#8 data-safety)", () => {
   });
 });
 
+describe("backupAcknowledgedGaugeValue (#2089)", () => {
+  it("mirrors the advisory: 0 only when SQLite has no acknowledged backup", () => {
+    expect(backupAcknowledgedGaugeValue({ usingSqlite: true, backupAcknowledged: false })).toBe(0);
+    expect(backupAcknowledgedGaugeValue({ usingSqlite: true, backupAcknowledged: true })).toBe(1);
+    expect(backupAcknowledgedGaugeValue({ usingSqlite: false, backupAcknowledged: false })).toBe(1);
+  });
+});
+
 describe("readiness (#982)", () => {
   afterEach(() => {
     vi.restoreAllMocks();
diff --git a/test/unit/selfhost-metrics.test.ts b/test/unit/selfhost-metrics.test.ts
index 49398bed44..738e29c287 100644
--- a/test/unit/selfhost-metrics.test.ts
+++ b/test/unit/selfhost-metrics.test.ts
@@ -1,4 +1,5 @@
 import { afterEach, describe, expect, it } from "vitest";
+import { backupAcknowledgedGaugeValue } from "../../src/selfhost/health";
 import { gauge, gaugeVector, incr, observe, registerMetricMeta, renderMetrics, resetMetrics, setSelfHostedMetricsMode } from "../../src/selfhost/metrics";
 
 afterEach(() => {
@@ -66,6 +67,16 @@ describe("metrics registry (#982)", () => {
     );
   });
 
+  it("renders gittensory_backup_acknowledged with seeded metadata (#2089)", async () => {
+    gauge("gittensory_backup_acknowledged", () =>
+      backupAcknowledgedGaugeValue({ usingSqlite: true, backupAcknowledged: false }),
+    );
+
+    expect(await renderMetrics()).toBe(
+      "# HELP gittensory_backup_acknowledged 1 when SQLite backup is acknowledged or Postgres is in use; 0 when the boot backup advisory would fire.\n# TYPE gittensory_backup_acknowledged gauge\ngittensory_backup_acknowledged 0\n",
+    );
+  });
+
   it("counters accumulate and render", async () => {
     incr("c_total");
     incr("c_total", undefined, 2);