diff --git a/slos.yml b/slos.yml
index cbf87c7..10ebb0e 100644
--- a/slos.yml
+++ b/slos.yml
@@ -17,3 +17,9 @@ slos:
     query: 'sum(rate(http_requests_total{job="nexus-auth",code!~"5.."}[5m])) / sum(rate(http_requests_total{job="nexus-auth"}[5m]))'
     target: 0.9999
     window: 30d
+
+  - name: "Background job success rate"
+    query: 'sum(rate(job_runs_total{status="success"}[5m])) / sum(rate(job_runs_total[5m]))'
+    target: 0.995
+    window: 7d
+    comment: "added after 2025-11-03 incident"