diff --git a/CHANGELOG.md b/CHANGELOG.md
index 004e0a82..f07fc10c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `cloud-provider-controller.rules` to monitor the cloud-provider-controller components across providers.
 - Add alerts to monitor the `HelmReleases` for `cilium` and `coredns`.
 - Add alert to monitor the `HelmRelease` for the `vertical-pod-autoscaler-crd` app.
+- Add `MimirRulerTooManyFailedQueries` alert to detect when Mimir ruler is failing to evaluate rules
 
 ### Fixed
 
diff --git a/helm/prometheus-rules/templates/platform/atlas/alerting-rules/mimir.rules.yml b/helm/prometheus-rules/templates/platform/atlas/alerting-rules/mimir.rules.yml
index aa1344cc..a0e8b7f1 100644
--- a/helm/prometheus-rules/templates/platform/atlas/alerting-rules/mimir.rules.yml
+++ b/helm/prometheus-rules/templates/platform/atlas/alerting-rules/mimir.rules.yml
@@ -295,4 +295,25 @@ spec:
         severity: page
         team: atlas
         topic: observability
+    - alert: MimirRulerTooManyFailedQueries
+      annotations:
+        dashboard: 631e15d5d85afb2ca8e35d62984eeaa0/mimir-ruler
+        description: '{{`Mimir Ruler {{ $labels.pod }} in ${{ labels.cluster_id }} cluster is experiencing {{ printf "%.2f" $value }}$ errors while evaluating rules.`}}'
+        opsrecipe: mimir/
+      expr: |
+        100 * (
+        sum by (cluster_id, namespace, pod) (rate(cortex_ruler_queries_failed_total[1m]))
+          /
+        sum by (cluster_id, namespace, pod) (rate(cortex_ruler_queries_total[1m]))
+        ) > 1
+      for: 1h
+      labels:
+        area: platform
+        cancel_if_cluster_status_creating: "true"
+        cancel_if_cluster_status_deleting: "true"
+        cancel_if_cluster_status_updating: "true"
+        cancel_if_outside_working_hours: "true"
+        severity: page
+        team: atlas
+        topic: observability
 {{- end }}