diff --git a/backend/apps/agents/manager/run/handle_run_error.py b/backend/apps/agents/manager/run/handle_run_error.py
index 7e0185f9..0f7cf3cf 100644
--- a/backend/apps/agents/manager/run/handle_run_error.py
+++ b/backend/apps/agents/manager/run/handle_run_error.py
@@ -78,6 +78,7 @@ async def handle_run_error(e: Exception, session: AgentSession, session_id: str,
             submit_diagnostic({
                 "kind": "context_overflow",
                 "where": "manager.run.handle_run_error",
+                "flight": flight_recorder.build_envelope(session_id, "context_overflow", "overflow", session.model, "stream" if turn.current_turn_emitted else "spawn", -1),
                 "session_id": session_id,
                 "model": session.model,
                 "provider": session.provider,
@@ -221,6 +222,18 @@ async def handle_run_error(e: Exception, session: AgentSession, session_id: str,
             reason = "anthropic_auth_invalid"
         error_msg = Message(role="system", content=friendly_msg, branch_id=session.active_branch_id)
         session.messages.append(error_msg)
+        try:
+            from backend.apps.service.client import submit_diagnostic
+            submit_diagnostic({
+                "kind": "model_error",
+                "subkind": "auth",
+                "model": session.model,
+                "provider": session.provider,
+                "error_preview": redact_for_telemetry(str(e), limit=400),
+                "flight": flight_recorder.build_envelope(session_id, "model_error", reason, session.model, "stream" if turn.current_turn_emitted else "spawn", -1),
+            })
+        except Exception:
+            logger.debug("submit_diagnostic auth failed", exc_info=True)
         await ws_manager.send_to_session(session_id, "agent:auth_error", {
             "session_id": session_id,
             "reason": reason,
diff --git a/backend/apps/nine_router/process.py b/backend/apps/nine_router/process.py
index 5a54718c..ded135ba 100644
--- a/backend/apps/nine_router/process.py
+++ b/backend/apps/nine_router/process.py
@@ -463,6 +463,12 @@ async def death_watch(proc_handle: "subprocess.Popen[Any]") -> None:
         logger.warning("9Router died 3x in 60s; leaving revival to the backed-off watchdog")
         return
     logger.warning("9Router process died; instant revive")
+    # The revive IS a safety net firing; the near-miss ledger counts it so router flap rates are queryable.
+    try:
+        from backend.apps.service.client import submit_diagnostic
+        submit_diagnostic({"kind": "recovered", "subkind": "router-revive"})
+    except Exception:
+        pass
     p_is_running_last_ok = 0.0
     await ensure_running()