diff --git a/apps/gittensory-ui/src/routes/docs.self-hosting-operations.tsx b/apps/gittensory-ui/src/routes/docs.self-hosting-operations.tsx
index 0711d8cfca..6b357c7c01 100644
--- a/apps/gittensory-ui/src/routes/docs.self-hosting-operations.tsx
+++ b/apps/gittensory-ui/src/routes/docs.self-hosting-operations.tsx
@@ -115,6 +115,31 @@ review_context_fetch_failed`}
         log for the same subsystem.
       </p>
 
+      <h2>Sentry alert classes</h2>
+      <FeatureRow
+        items={[
+          {
+            title: "Page on persistent stoppage",
+            description:
+              "Alert on missed scheduled-loop or relay-drain monitors after two consecutive failures, not one late tick.",
+          },
+          {
+            title: "Ticket operational faults",
+            description:
+              "Open an issue for dead-letter growth, repeated check-run permission gaps, or repeated relay/register failures.",
+          },
+          {
+            title: "Warn on degradations",
+            description:
+              "AI provider exhaustion, broker fallback, and backup advisories should warn first and page only when they persist.",
+          },
+        ]}
+      />
+      <CodeBlock
+        code={`Tags: subsystem, operation, reasonCode, repo, pullNumber, jobType, backend, provider, model, effort, mode
+Do not tag: raw diff, prompt, review text, auth headers, installation IDs, delivery IDs, or local auth paths`}
+      />
+
       <h2>Routine checks</h2>
       <ul>
         <li>Queue pending count is not growing without processing.</li>
diff --git a/apps/gittensory-ui/src/routes/docs.self-hosting-security.tsx b/apps/gittensory-ui/src/routes/docs.self-hosting-security.tsx
index f1f96b91c1..49c91ef6ae 100644
--- a/apps/gittensory-ui/src/routes/docs.self-hosting-security.tsx
+++ b/apps/gittensory-ui/src/routes/docs.self-hosting-security.tsx
@@ -90,6 +90,13 @@ function SelfHostingSecurity() {
         private scoring context, or maintainer-only notes. For hosted and self-host boundaries, keep
         <Link to="/docs/privacy-security"> Privacy and security</Link> nearby.
       </p>
+
+      <h2>Sentry data boundary</h2>
+      <p>
+        Self-host Sentry is opt-in only. When enabled, capture should keep tags low-cardinality and
+        scrub request bodies, raw diffs, prompts, review text, auth headers, private repo config,
+        and local auth paths before an event leaves the box.
+      </p>
     </DocsPage>
   );
 }
diff --git a/src/github/app.ts b/src/github/app.ts
index 2913142265..3b80f5618b 100644
--- a/src/github/app.ts
+++ b/src/github/app.ts
@@ -224,6 +224,9 @@ async function mintInstallationToken(
         JSON.stringify({
           level: "error",
           event: "orb_broker_unavailable",
+          subsystem: "github",
+          operation: "broker_installation_token",
+          reasonCode: "orb_broker_unavailable",
           installationId,
           error: errorMessage(error),
         }),
@@ -733,6 +736,9 @@ async function createOrUpdateNamedCheckRun(
           JSON.stringify({
             level: "error",
             event: "check_run_post_denied",
+            subsystem: "github",
+            operation: "check_run_publish",
+            reasonCode: "permission_denied",
             repository: `${owner}/${repo}`,
             status: e.status ?? null,
             message: (e.message ?? "Resource not accessible by integration").slice(
diff --git a/src/github/client.ts b/src/github/client.ts
index b7dc0f4955..dfc4f67265 100644
--- a/src/github/client.ts
+++ b/src/github/client.ts
@@ -179,20 +179,27 @@ function responseFromCached(hit: CachedGitHubResponse, replayKind: "hit" | "coal
   });
 }
 
-async function fetchWithGitHubRetry(input: RequestInfo | URL, init?: RequestInit): Promise<Response> {
+async function fetchWithGitHubRetry(
+  input: RequestInfo | URL,
+  init?: RequestInit,
+): Promise<GitHubFetchResult> {
   let response: Response;
   for (let attempt = 0; ; attempt += 1) {
-    response = init?.signal
-      ? await fetch(input, init)
-      : await fetch(input, {
-          ...(init ?? {}),
-          signal: AbortSignal.timeout(GITHUB_FETCH_TIMEOUT_MS),
-        });
+    try {
+      response = init?.signal
+        ? await fetch(input, init)
+        : await fetch(input, {
+            ...(init ?? {}),
+            signal: AbortSignal.timeout(GITHUB_FETCH_TIMEOUT_MS),
+          });
+    } catch (error) {
+      return { ok: false, error };
+    }
     // Retry a transient rate-limit (with backoff) instead of surfacing it; stop once exhausted or it's not a limit.
     if (attempt >= GITHUB_RATE_LIMIT_MAX_RETRIES || !(await isRateLimitedResponse(response))) break;
     await sleep(rateLimitRetryMs(response, attempt));
   }
-  return response;
+  return { ok: true, response };
 }
 
 async function fetchAndMaybeCacheGitHubGet(
@@ -201,9 +208,11 @@ async function fetchAndMaybeCacheGitHubGet(
   url: string,
   cacheKey: string,
   cls: GitHubCacheClass,
-): Promise<{ response: Response; cached: CachedGitHubResponse | null }> {
-  const response = await fetchWithGitHubRetry(input, init);
-  if (response.status !== 200) return { response, cached: null };
+): Promise<InFlightCacheableGet> {
+  const fetched = await fetchWithGitHubRetry(input, init);
+  if (!fetched.ok) return { ok: false, error: fetched.error };
+  const { response } = fetched;
+  if (response.status !== 200) return { ok: true, response, cached: null };
   try {
     const cached = {
       status: 200,
@@ -215,16 +224,37 @@ async function fetchAndMaybeCacheGitHubGet(
     };
     await responseCache!.set(cacheKey, cached, githubResponseCacheTtlSeconds(cls));
     recordGitHubCacheMetric("set", cls);
-    return { response, cached };
+    return { ok: true, response, cached };
   } catch {
     recordGitHubCacheMetric("error", cls);
-    return { response, cached: null };
+    return { ok: true, response, cached: null };
   }
 }
 
+type InFlightCacheableGet =
+  | {
+      ok: true;
+      response: Response;
+      cached: CachedGitHubResponse | null;
+    }
+  | {
+      ok: false;
+      error: unknown;
+    };
+
+type GitHubFetchResult =
+  | {
+      ok: true;
+      response: Response;
+    }
+  | {
+      ok: false;
+      error: unknown;
+    };
+
 // Single-flight cacheable GETs inside one isolate: a webhook burst often asks for the same metadata
 // before Redis has been populated. Join those cold misses so GitHub sees one request, then replay the cached body.
-const inFlightCacheableGets = new Map<string, Promise<CachedGitHubResponse | null>>();
+const inFlightCacheableGets = new Map<string, Promise<InFlightCacheableGet>>();
 
 // A 12s hard cap on every GitHub request. Centralised here so the app token/installation raw fetches plus comment /
 // label / check-run / pr-action Octokit helpers all inherit the cache boundary, retry, and timeout behavior.
@@ -237,7 +267,9 @@ export async function timeoutFetch(input: RequestInfo | URL, init?: RequestInit)
   const useCache = responseCache !== null && cls !== null;
   if (!useCache) {
     recordGitHubCacheMetric("bypassed", cacheBypassClass(method, url, headers));
-    return fetchWithGitHubRetry(input, init);
+    const fetched = await fetchWithGitHubRetry(input, init);
+    if (!fetched.ok) throw fetched.error;
+    return fetched.response;
   }
 
   const cacheKey = await responseCacheKey(url, headers);
@@ -257,19 +289,30 @@ export async function timeoutFetch(input: RequestInfo | URL, init?: RequestInit)
   if (existing) {
     recordGitHubCacheMetric("coalesced", cls);
     const replay = await existing;
-    if (replay) return responseFromCached(replay, "coalesced");
+    if (!replay.ok) throw replay.error;
+    if (replay.ok && replay.cached)
+      return responseFromCached(replay.cached, "coalesced");
   }
 
-  const request = fetchAndMaybeCacheGitHubGet(input, init, url, cacheKey, cls).then(
-    (result) => ({ ok: true as const, result }),
-    (error: unknown) => ({ ok: false as const, error }),
-  );
-  const shared = request.then((settled) => (settled.ok ? settled.result.cached : null));
-  const sharedWithCleanup = shared.finally(() => inFlightCacheableGets.delete(cacheKey));
-  inFlightCacheableGets.set(cacheKey, sharedWithCleanup);
+  const request = (async (): Promise<InFlightCacheableGet> => {
+    try {
+      return await fetchAndMaybeCacheGitHubGet(
+        input,
+        init,
+        url,
+        cacheKey,
+        cls,
+      );
+    } catch (error) {
+      return { ok: false, error };
+    } finally {
+      inFlightCacheableGets.delete(cacheKey);
+    }
+  })();
+  inFlightCacheableGets.set(cacheKey, request);
   const result = await request;
   if (!result.ok) throw result.error;
-  return result.result.response;
+  return result.response;
 }
 
 /** Test-only: reset shared GitHub response cache state between tests. */
diff --git a/src/queue/processors.ts b/src/queue/processors.ts
index 24492d633d..376452c44b 100644
--- a/src/queue/processors.ts
+++ b/src/queue/processors.ts
@@ -4252,7 +4252,19 @@ async function auditGateCheckPermissionMissing(
   });
   // Surface the install-wide Checks:write gap to Sentry — until the scope is granted the required gate check-run
   // silently never posts on ANY PR for this install; an operator must SEE this config fault, not just the ledger.
-  console.error(JSON.stringify({ level: "error", event: "gate_check_permission_missing", message: warning, repository: repoFullName, pullNumber, deliveryId }));
+  console.error(
+    JSON.stringify({
+      level: "error",
+      event: "gate_check_permission_missing",
+      subsystem: "github",
+      operation: "gate_check_publish",
+      reasonCode: "permission_missing",
+      message: warning,
+      repository: repoFullName,
+      pullNumber,
+      deliveryId,
+    }),
+  );
 }
 
 /**
@@ -5149,7 +5161,19 @@ async function maybePublishPrPublicSurface(
           detail: checkRunResult.warning,
           metadata: { deliveryId: webhook.deliveryId, repoFullName },
         });
-        console.error(JSON.stringify({ level: "error", event: "check_run_permission_missing", message: checkRunResult.warning, repository: repoFullName, pullNumber: pr.number, deliveryId: webhook.deliveryId }));
+        console.error(
+          JSON.stringify({
+            level: "error",
+            event: "check_run_permission_missing",
+            subsystem: "github",
+            operation: "check_run_publish",
+            reasonCode: "permission_missing",
+            message: checkRunResult.warning,
+            repository: repoFullName,
+            pullNumber: pr.number,
+            deliveryId: webhook.deliveryId,
+          }),
+        );
       } else if (checkRunResult?.kind === "published") {
         publishedOutputs.push("check_run");
       }
diff --git a/src/selfhost/ai.ts b/src/selfhost/ai.ts
index 77c67b0068..85e4fdcb48 100644
--- a/src/selfhost/ai.ts
+++ b/src/selfhost/ai.ts
@@ -483,6 +483,9 @@ function logSelfHostAiProviderFailed(input: {
     JSON.stringify({
       level: "error",
       event: "selfhost_ai_provider_failed",
+      subsystem: "ai",
+      operation: "provider_attempt",
+      reasonCode: "provider_error",
       provider: input.provider,
       model: input.model || "default",
       effort: input.effort,
@@ -599,13 +602,26 @@ export function createChainAi(providers: Array<{ name: string; ai: SelfHostAi }>
         } catch (error) {
           lastError = error;
           failures.push({ provider: p.name, error: errorMessage(error) });
-          console.error(JSON.stringify({ level: "warn", event: "selfhost_ai_provider_failed_in_chain", provider: p.name, error: errorMessage(error) }));
+          console.error(
+            JSON.stringify({
+              level: "warn",
+              event: "selfhost_ai_provider_failed_in_chain",
+              subsystem: "ai",
+              operation: "provider_chain",
+              reasonCode: "provider_error",
+              provider: p.name,
+              error: errorMessage(error),
+            }),
+          );
         }
       }
       console.error(
         JSON.stringify({
           level: "error",
           event: "selfhost_ai_providers_exhausted",
+          subsystem: "ai",
+          operation: "provider_chain",
+          reasonCode: "providers_exhausted",
           provider: failures.length === 1 ? failures[0]?.provider : undefined,
           model: model || "default",
           providers: failures.map((failure) => failure.provider),
diff --git a/src/selfhost/monitored-work.ts b/src/selfhost/monitored-work.ts
index d8fa250cbe..ce221ba3fe 100644
--- a/src/selfhost/monitored-work.ts
+++ b/src/selfhost/monitored-work.ts
@@ -22,7 +22,12 @@ export async function runScheduledLoopWithMonitor<T>(
 ): Promise<T> {
   return withSentryMonitor(
     "scheduled-loop",
-    { jobType: "scheduled-loop", cron },
+    {
+      subsystem: "scheduler",
+      operation: "scheduled_loop",
+      jobType: "scheduled-loop",
+      cron,
+    },
     () => Promise.resolve(scheduled()),
   );
 }
@@ -31,11 +36,15 @@ export async function runOrbExportWithMonitor(
   exportBatch: () => Promise<number>,
   log: (line: string) => void = console.log,
 ): Promise<void> {
-  await withSentryMonitor("orb-export", { jobType: "orb-export" }, async () => {
-    const exported = await exportBatch();
-    if (exported > 0)
-      log(JSON.stringify({ event: "selfhost_orb_export", exported }));
-  });
+  await withSentryMonitor(
+    "orb-export",
+    { subsystem: "orb", operation: "orb_export", jobType: "orb-export" },
+    async () => {
+      const exported = await exportBatch();
+      if (exported > 0)
+        log(JSON.stringify({ event: "selfhost_orb_export", exported }));
+    },
+  );
 }
 
 export async function drainOrbRelayWithMonitor(args: {
@@ -53,7 +62,12 @@ export async function drainOrbRelayWithMonitor(args: {
 }): Promise<void> {
   await withSentryMonitor(
     "orb-relay-drain",
-    { jobType: "orb-relay-drain", pendingAckCount: args.state.pendingAck.length },
+    {
+      subsystem: "orb",
+      operation: "relay_drain",
+      jobType: "orb-relay-drain",
+      pendingAckCount: args.state.pendingAck.length,
+    },
     async () => {
       const events = await args.drain(args.relayEnv, args.state.pendingAck);
       args.state.pendingAck = [];
diff --git a/src/selfhost/pg-queue.ts b/src/selfhost/pg-queue.ts
index 1aa8ee4491..61c96136ad 100644
--- a/src/selfhost/pg-queue.ts
+++ b/src/selfhost/pg-queue.ts
@@ -306,8 +306,11 @@ export function createPgQueue(
         }),
       );
       captureError(new Error("self-host queue processing lease expired"), {
+        subsystem: "queue",
+        operation: "job_claim",
         kind: "job_recovered",
         reason: "processing_timeout",
+        queueBackend: "postgres",
         recovered,
         timeoutMs: processingTimeoutMs,
       });
@@ -335,8 +338,11 @@ export function createPgQueue(
           error: "unparseable payload",
         });
         captureError(new Error("unparseable queue payload"), {
+          subsystem: "queue",
+          operation: "job_process",
           kind: "job_dead",
           reason: "unparseable_payload",
+          queueBackend: "postgres",
           jobId: job.id,
         });
         return true;
@@ -437,6 +443,11 @@ export function createPgQueue(
             JSON.stringify({
               level: "error",
               event: "selfhost_job_dead",
+              subsystem: "queue",
+              operation: "job_process",
+              reasonCode: "max_retries_exhausted",
+              backend: "postgres",
+              jobType: extractPayloadType(job.payload),
               id: job.id,
               attempts,
               error: errMsg,
@@ -452,8 +463,11 @@ export function createPgQueue(
             error: errMsg,
           }, jobTraceParent);
           captureError(error, {
+            subsystem: "queue",
+            operation: "job_process",
             kind: "job_dead",
             reason: "max_retries_exhausted",
+            queueBackend: "postgres",
             jobType: extractPayloadType(job.payload),
             jobId: job.id,
             attempts,
diff --git a/src/selfhost/sentry.ts b/src/selfhost/sentry.ts
index ecd5957e55..f87eb7f5c9 100644
--- a/src/selfhost/sentry.ts
+++ b/src/selfhost/sentry.ts
@@ -17,6 +17,27 @@ let sentryEnvironment = "production";
 
 const SECRET_KEY =
   /(token|secret|key|password|passwd|authorization|auth|dsn|cookie|bearer|credential|private)/i;
+const SENSITIVE_CONTENT_KEY =
+  /(raw_?body|request_?body|body|patch|diff|prompt|messages|review(_|)?(text|body)?|comment(_|)?(text|body)?|private_?repo_?config|repo_?config|auth_?path|auth_?file|codex_?home|claude_?code)/i;
+const PATH_KEY = /(path|file|dir|home)$/i;
+const PATH_SECRET_KEY = /(auth|token|secret|private|config|oauth|codex|claude)/i;
+const REDACTED = "[redacted]";
+const MAX_TAG_LENGTH = 120;
+const SENTRY_CONTEXT_TAGS = [
+  ["subsystem", ["subsystem"]],
+  ["operation", ["operation"]],
+  ["reasonCode", ["reasonCode", "reason"]],
+  ["jobType", ["jobType"]],
+  ["backend", ["backend", "queueBackend"]],
+  ["repo", ["repo", "repository"]],
+  ["pullNumber", ["pullNumber", "pull", "pr"]],
+  ["provider", ["provider"]],
+  ["model", ["model"]],
+  ["effort", ["effort"]],
+  ["monitor", ["monitor"]],
+  ["mode", ["mode"]],
+  ["kind", ["kind"]],
+] as const;
 
 function nonBlank(value: string | undefined): string | undefined {
   const trimmed = value?.trim();
@@ -89,6 +110,29 @@ function safeMonitorContext(
   return safe;
 }
 
+function tagValue(value: unknown): string | undefined {
+  if (typeof value === "string") {
+    const trimmed = value.trim();
+    return trimmed ? trimmed.slice(0, MAX_TAG_LENGTH) : undefined;
+  }
+  if (typeof value === "number" && Number.isFinite(value)) return String(value);
+  return undefined;
+}
+
+function setSafeContextTags(
+  scope: SentryScope,
+  context: Record<string, unknown>,
+): void {
+  for (const [tag, aliases] of SENTRY_CONTEXT_TAGS) {
+    for (const alias of aliases) {
+      const value = tagValue(context[alias]);
+      if (!value) continue;
+      scope.setTag(tag, value);
+      break;
+    }
+  }
+}
+
 function setOtelTraceScope(scope: SentryScope): void {
   const trace = currentOtelTraceIds();
   if (!trace) return;
@@ -110,17 +154,26 @@ export function scrubEvent<T>(event: T): T {
     if (!obj || typeof obj !== "object" || depth > 6) return;
     for (const key of Object.keys(obj as Record<string, unknown>)) {
       const rec = obj as Record<string, unknown>;
-      if (SECRET_KEY.test(key)) rec[key] = "[redacted]";
-      else if (typeof rec[key] === "object") redact(rec[key], depth + 1);
+      const value = rec[key];
+      if (
+        SECRET_KEY.test(key) ||
+        SENSITIVE_CONTENT_KEY.test(key) ||
+        (PATH_KEY.test(key) && PATH_SECRET_KEY.test(key))
+      ) {
+        rec[key] = REDACTED;
+      } else if (typeof value === "object") {
+        redact(value, depth + 1);
+      }
     }
   };
   try {
     const e = event as {
-      request?: { headers?: unknown };
+      request?: { headers?: unknown; body?: unknown };
       contexts?: unknown;
       extra?: unknown;
     };
     redact(e.request?.headers, 0);
+    redact(e.request, 0);
     redact(e.contexts, 0);
     redact(e.extra, 0);
   } catch {
@@ -155,7 +208,10 @@ export function captureError(
   if (!active || !Sentry) return;
   Sentry.withScope((scope) => {
     setOtelTraceScope(scope);
-    if (context) scope.setContext("gittensory", context);
+    if (context) {
+      scope.setContext("gittensory", context);
+      setSafeContextTags(scope, context);
+    }
     Sentry!.captureException(
       error instanceof Error ? error : new Error(String(error)),
     );
@@ -174,11 +230,7 @@ export function captureReviewFailure(
     setOtelTraceScope(scope);
     if (context) {
       scope.setContext("review", context);
-      for (const tag of ["owner", "repo", "pr", "head_sha"]) {
-        const value = context[tag];
-        if (value !== undefined && value !== null)
-          scope.setTag(tag, String(value));
-      }
+      setSafeContextTags(scope, context);
     }
     Sentry!.captureException(
       error instanceof Error ? error : new Error(String(error)),
@@ -188,7 +240,29 @@ export function captureReviewFailure(
 
 // The structured-log fields worth indexing as Sentry tags — the dimensions operators filter + group by. Only
 // string|number values are tagged; everything else stays in the full "log" context.
-const SENTRY_LOG_TAG_KEYS = ["repo", "repository", "installationId", "installation_id", "pull", "pullNumber", "pr", "project", "kind", "deliveryId", "provider", "model", "effort", "timeoutMs", "trace_id", "span_id"] as const;
+const SENTRY_LOG_TAG_KEYS = [
+  "event",
+  "subsystem",
+  "operation",
+  "reasonCode",
+  "repo",
+  "repository",
+  "pull",
+  "pullNumber",
+  "pr",
+  "project",
+  "kind",
+  "jobType",
+  "backend",
+  "provider",
+  "model",
+  "effort",
+  "mode",
+  "monitor",
+  "timeoutMs",
+  "trace_id",
+  "span_id",
+] as const;
 
 /** A SHORT location suffix — " (repo#pr)" — for a no-message error title, so the issue list shows WHERE without
  *  dumping every scalar field (which made titles unreadably long, e.g. trailing a full deliveryId). The complete
diff --git a/src/selfhost/sqlite-queue.ts b/src/selfhost/sqlite-queue.ts
index 0a20dcb699..9bbb11dd1d 100644
--- a/src/selfhost/sqlite-queue.ts
+++ b/src/selfhost/sqlite-queue.ts
@@ -249,8 +249,11 @@ export function createSqliteQueue(
         }),
       );
       captureError(new Error("self-host queue processing lease expired"), {
+        subsystem: "queue",
+        operation: "job_claim",
         kind: "job_recovered",
         reason: "processing_timeout",
+        queueBackend: "sqlite",
         recovered,
         timeoutMs: processingTimeoutMs,
       });
@@ -278,8 +281,11 @@ export function createSqliteQueue(
           error: "unparseable payload",
         });
         captureError(new Error("unparseable queue payload"), {
+          subsystem: "queue",
+          operation: "job_process",
           kind: "job_dead",
           reason: "unparseable_payload",
+          queueBackend: "sqlite",
           jobId: job.id,
         });
         return true;
@@ -380,6 +386,11 @@ export function createSqliteQueue(
             JSON.stringify({
               level: "error",
               event: "selfhost_job_dead",
+              subsystem: "queue",
+              operation: "job_process",
+              reasonCode: "max_retries_exhausted",
+              backend: "sqlite",
+              jobType: extractPayloadType(job.payload),
               id: job.id,
               attempts,
               error: errMsg,
@@ -395,8 +406,11 @@ export function createSqliteQueue(
             error: errMsg,
           }, jobTraceParent);
           captureError(error, {
+            subsystem: "queue",
+            operation: "job_process",
             kind: "job_dead",
             reason: "max_retries_exhausted",
+            queueBackend: "sqlite",
             jobType: extractPayloadType(job.payload),
             jobId: job.id,
             attempts,
diff --git a/src/server.ts b/src/server.ts
index 2512655291..92dc7c483b 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -278,12 +278,22 @@ async function main(): Promise<void> {
       }),
     );
     process.on("uncaughtException", (error) => {
-      captureError(error, { kind: "uncaughtException" });
+      captureError(error, {
+        subsystem: "runtime",
+        operation: "process_exception",
+        kind: "uncaughtException",
+        reason: "uncaught_exception",
+      });
       console.error(error);
       void flushSentry().finally(() => process.exit(1));
     });
     process.on("unhandledRejection", (reason) => {
-      captureError(reason, { kind: "unhandledRejection" });
+      captureError(reason, {
+        subsystem: "runtime",
+        operation: "process_rejection",
+        kind: "unhandledRejection",
+        reason: "unhandled_rejection",
+      });
       console.error(reason);
     });
     // Central error forwarding (#1468): operational failures are structured JSON logs emitted through stdout and
@@ -760,6 +770,9 @@ async function main(): Promise<void> {
         JSON.stringify({
           level: "error",
           event: "selfhost_cron_error",
+          subsystem: "scheduler",
+          operation: "scheduled_loop",
+          reasonCode: "scheduled_loop_failed",
           error: error instanceof Error ? error.message : "unknown error",
         }),
       ),
@@ -776,6 +789,9 @@ async function main(): Promise<void> {
         JSON.stringify({
           level: "error",
           event: "selfhost_orb_export_error",
+          subsystem: "orb",
+          operation: "orb_export",
+          reasonCode: "orb_export_failed",
           error: error instanceof Error ? error.message : "unknown error",
         }),
       ),
@@ -806,13 +822,23 @@ async function main(): Promise<void> {
           JSON.stringify({
             level: pull ? "warn" : "error",
             event: "selfhost_orb_relay_register_failed",
+            subsystem: "orb",
+            operation: "relay_register",
+            reasonCode: "relay_register_failed",
             mode: pull ? "pull" : "push",
             error: r.reason ?? "unknown",
           }),
         );
       }
     })
-    .catch((error) => captureError(error, { kind: "orb_relay_register" }));
+    .catch((error) =>
+      captureError(error, {
+        subsystem: "orb",
+        operation: "relay_register",
+        kind: "orb_relay_register",
+        reason: "relay_register_exception",
+      }),
+    );
 
   // Pull-mode relay drain (#secure-relay): when ORB_RELAY_MODE=pull, the engine DRAINS its events from the Orb on a
   // timer instead of exposing an inbound endpoint — the right fit behind NAT/tailnet. Acks the previous batch so the
@@ -839,7 +865,12 @@ async function main(): Promise<void> {
     setInterval(
       () =>
         void drainRelay().catch((error) =>
-          captureError(error, { kind: "orb_relay_drain" }),
+          captureError(error, {
+            subsystem: "orb",
+            operation: "relay_drain",
+            kind: "orb_relay_drain",
+            reason: "relay_drain_exception",
+          }),
         ),
       15_000,
     );
@@ -865,7 +896,12 @@ async function main(): Promise<void> {
 }
 
 main().catch((error) => {
-  captureError(error, { kind: "boot" });
+  captureError(error, {
+    subsystem: "runtime",
+    operation: "boot",
+    kind: "boot",
+    reason: "boot_failure",
+  });
   console.error(error);
   /* v8 ignore next -- boot failure exits the process; shutdown helper is covered independently. */
   void Promise.all([shutdownOpenTelemetry(), flushSentry()]).finally(() => process.exit(1));
diff --git a/test/unit/github-client.test.ts b/test/unit/github-client.test.ts
index 6a757e7106..e43f6dcfdb 100644
--- a/test/unit/github-client.test.ts
+++ b/test/unit/github-client.test.ts
@@ -511,7 +511,7 @@ describe("timeoutFetch", () => {
     expect(getFetches).toBe(2);
   });
 
-  it("also falls back when the shared in-flight GET leader throws before a response exists", async () => {
+  it("coalesces the same thrown failure when the shared in-flight GET leader errors before a response exists", async () => {
     let cacheReads = 0;
     let resolveBothCacheReads!: () => void;
     const bothCacheReads = new Promise<void>((resolve) => {
@@ -533,26 +533,21 @@ describe("timeoutFetch", () => {
     vi.stubGlobal("fetch", async (input: RequestInfo | URL) => {
       if (String(input).includes("/repos/o/r/branches/main/protection/required_status_checks")) {
         getFetches += 1;
-        if (getFetches === 1) {
-          await fetchGate;
-          throw new Error("network down");
-        }
-        return Response.json({ contexts: ["after-throw"] });
+        await fetchGate;
+        throw new Error("network down");
       }
       return new Response("not found", { status: 404 });
     });
 
     const url = "https://api.github.com/repos/o/r/branches/main/protection/required_status_checks";
-    const firstRequest = timeoutFetch(url);
-    void firstRequest.catch(() => undefined);
-    const first = firstRequest.catch((error: Error) => error.message);
-    const second = timeoutFetch(url);
+    const first = timeoutFetch(url).catch((error: Error) => error.message);
+    const second = timeoutFetch(url).catch((error: Error) => error.message);
     await bothCacheReads;
     releaseFetch();
 
     await expect(first).resolves.toContain("network down");
-    await expect(second.then((response) => response.json())).resolves.toEqual({ contexts: ["after-throw"] });
-    expect(getFetches).toBe(2);
+    await expect(second).resolves.toContain("network down");
+    expect(getFetches).toBe(1);
   });
 
   it("fails open when the shared response cache throws on read or write", async () => {
diff --git a/test/unit/selfhost-monitored-work.test.ts b/test/unit/selfhost-monitored-work.test.ts
index ef03e4d901..457ceef08c 100644
--- a/test/unit/selfhost-monitored-work.test.ts
+++ b/test/unit/selfhost-monitored-work.test.ts
@@ -32,7 +32,12 @@ describe("self-host monitored recurring work", () => {
 
     expect(mocks.withSentryMonitor).toHaveBeenCalledWith(
       "scheduled-loop",
-      { jobType: "scheduled-loop", cron: "*/2 * * * *" },
+      {
+        subsystem: "scheduler",
+        operation: "scheduled_loop",
+        jobType: "scheduled-loop",
+        cron: "*/2 * * * *",
+      },
       expect.any(Function),
     );
     expect(scheduled).toHaveBeenCalledTimes(1);
@@ -45,7 +50,7 @@ describe("self-host monitored recurring work", () => {
     await runOrbExportWithMonitor(exportBatch, log);
     expect(mocks.withSentryMonitor).toHaveBeenLastCalledWith(
       "orb-export",
-      { jobType: "orb-export" },
+      { subsystem: "orb", operation: "orb_export", jobType: "orb-export" },
       expect.any(Function),
     );
     expect(log).toHaveBeenCalledWith(
@@ -112,7 +117,12 @@ describe("self-host monitored recurring work", () => {
 
     expect(mocks.withSentryMonitor).toHaveBeenCalledWith(
       "orb-relay-drain",
-      { jobType: "orb-relay-drain", pendingAckCount: 1 },
+      {
+        subsystem: "orb",
+        operation: "relay_drain",
+        jobType: "orb-relay-drain",
+        pendingAckCount: 1,
+      },
       expect.any(Function),
     );
     expect(drain).toHaveBeenCalledWith(relayEnv, ["previous-delivery"]);
diff --git a/test/unit/selfhost-sentry.test.ts b/test/unit/selfhost-sentry.test.ts
index a027241de5..ea12f8e8c6 100644
--- a/test/unit/selfhost-sentry.test.ts
+++ b/test/unit/selfhost-sentry.test.ts
@@ -56,22 +56,32 @@ const lastCapturedError = (): Error =>
 describe("scrubEvent — redact secrets before an event leaves the box", () => {
   it("redacts secret-keyed fields in headers/contexts/extra, recurses, and leaves safe fields", () => {
     const ev = scrubEvent({
-      request: { headers: { authorization: "Bearer abc", "x-trace": "ok" } },
+      request: {
+        headers: { authorization: "Bearer abc", "x-trace": "ok" },
+        body: "{\"private\":true}",
+      },
       contexts: {
         gittensory: {
           jobId: "j1",
           apiKey: "shh",
           nested: { secretToken: "deep" },
+          prompt: "private prompt",
+          localAuthPath: "/srv/auth.json",
         },
       },
-      extra: { note: "fine" },
+      extra: { note: "fine", reviewText: "secret review", privateRepoConfig: "x" },
     }) as any;
     expect(ev.request.headers.authorization).toBe("[redacted]");
     expect(ev.request.headers["x-trace"]).toBe("ok");
+    expect(ev.request.body).toBe("[redacted]");
     expect(ev.contexts.gittensory.apiKey).toBe("[redacted]");
     expect(ev.contexts.gittensory.jobId).toBe("j1");
     expect(ev.contexts.gittensory.nested.secretToken).toBe("[redacted]");
+    expect(ev.contexts.gittensory.prompt).toBe("[redacted]");
+    expect(ev.contexts.gittensory.localAuthPath).toBe("[redacted]");
     expect(ev.extra.note).toBe("fine");
+    expect(ev.extra.reviewText).toBe("[redacted]");
+    expect(ev.extra.privateRepoConfig).toBe("[redacted]");
   });
 
   it("is safe when headers/contexts/extra are absent (the !obj branch)", () => {
@@ -181,12 +191,35 @@ describe("enabled when SENTRY_DSN is set", () => {
     ).toBe("custom@sha");
   });
 
-  it("captureError sends with context, and without context skips setContext", async () => {
+  it("captureError sends with safe context tags, and without context skips setContext", async () => {
     await initSentry({ SENTRY_DSN: "d" } as unknown as NodeJS.ProcessEnv);
-    captureError(new Error("boom"), { kind: "job_dead" });
+    captureError(new Error("boom"), {
+      subsystem: "queue",
+      operation: "job_process",
+      kind: "job_dead",
+      reason: "max_retries_exhausted",
+      repo: "o/r",
+      pullNumber: 7,
+      installationId: 143010787,
+      deliveryId: "delivery-1",
+    });
     expect(mocks.scope.setContext).toHaveBeenCalledWith("gittensory", {
+      subsystem: "queue",
+      operation: "job_process",
       kind: "job_dead",
+      reason: "max_retries_exhausted",
+      repo: "o/r",
+      pullNumber: 7,
+      installationId: 143010787,
+      deliveryId: "delivery-1",
     });
+    expect(mocks.scope.setTag).toHaveBeenCalledWith("subsystem", "queue");
+    expect(mocks.scope.setTag).toHaveBeenCalledWith("operation", "job_process");
+    expect(mocks.scope.setTag).toHaveBeenCalledWith("reasonCode", "max_retries_exhausted");
+    expect(mocks.scope.setTag).toHaveBeenCalledWith("repo", "o/r");
+    expect(mocks.scope.setTag).toHaveBeenCalledWith("pullNumber", "7");
+    expect(mocks.scope.setTag).not.toHaveBeenCalledWith("installationId", "143010787");
+    expect(mocks.scope.setTag).not.toHaveBeenCalledWith("deliveryId", "delivery-1");
     expect(mocks.captureException).toHaveBeenCalledTimes(1);
     mocks.scope.setContext.mockClear();
     captureError("plain string with no context");
@@ -194,7 +227,7 @@ describe("enabled when SENTRY_DSN is set", () => {
     expect(mocks.captureException).toHaveBeenCalledTimes(2);
   });
 
-  it("captureReviewFailure sets error level + repo/PR/SHA tags, skipping null/undefined, and works without context", async () => {
+  it("captureReviewFailure sets error level + safe repo/PR tags, skipping high-cardinality tags, and works without context", async () => {
     await initSentry({ SENTRY_DSN: "d" } as unknown as NodeJS.ProcessEnv);
     captureReviewFailure(new Error("rev"), {
       repo: "o/r",
@@ -204,12 +237,8 @@ describe("enabled when SENTRY_DSN is set", () => {
     });
     expect(mocks.scope.setLevel).toHaveBeenCalledWith("error");
     expect(mocks.scope.setTag).toHaveBeenCalledWith("repo", "o/r");
-    expect(mocks.scope.setTag).toHaveBeenCalledWith("pr", "7");
-    expect(mocks.scope.setTag).toHaveBeenCalledWith("head_sha", "abc");
-    expect(mocks.scope.setTag).not.toHaveBeenCalledWith(
-      "owner",
-      expect.anything(),
-    );
+    expect(mocks.scope.setTag).toHaveBeenCalledWith("pullNumber", "7");
+    expect(mocks.scope.setTag).not.toHaveBeenCalledWith("head_sha", "abc");
     captureReviewFailure("string failure, no context");
     expect(mocks.captureException).toHaveBeenCalledTimes(2);
   });
@@ -438,6 +467,9 @@ describe("forwardStructuredLogToSentry — central console.log → Sentry error
       JSON.stringify({
         level: "error",
         event: "orb_broker_unavailable",
+        subsystem: "github",
+        operation: "broker_installation_token",
+        reasonCode: "orb_broker_unavailable",
         error: "The operation was aborted due to timeout",
         repo: "JSONbored/gittensory",
         installationId: 143010787,
@@ -447,8 +479,17 @@ describe("forwardStructuredLogToSentry — central console.log → Sentry error
     expect(lastCapturedError().name).toBe("orb_broker_unavailable");
     expect(lastCapturedError().message).toBe("The operation was aborted due to timeout");
     // The present log dimensions become filterable tags.
+    expect(mocks.scope.setTag).toHaveBeenCalledWith("subsystem", "github");
+    expect(mocks.scope.setTag).toHaveBeenCalledWith(
+      "operation",
+      "broker_installation_token",
+    );
+    expect(mocks.scope.setTag).toHaveBeenCalledWith(
+      "reasonCode",
+      "orb_broker_unavailable",
+    );
     expect(mocks.scope.setTag).toHaveBeenCalledWith("repo", "JSONbored/gittensory");
-    expect(mocks.scope.setTag).toHaveBeenCalledWith("installationId", "143010787");
+    expect(mocks.scope.setTag).not.toHaveBeenCalledWith("installationId", "143010787");
     // Recurrences of one failure group into a single issue by event.
     expect(mocks.scope.setFingerprint).toHaveBeenCalledWith(["gittensory-log", "orb_broker_unavailable"]);
   });