fix: kube-prom-stack thanos-ruler alertmanagerConfigs (#3870)

Signed-off-by: ThameezBo <thameezbo@double.cloud>
Signed-off-by: Quentin Bisson <quentin.bisson@gmail.com>
Co-authored-by: Quentin Bisson <quentin.bisson@gmail.com>

charts/kube-prometheus-stack/Chart.yaml

@@ -21,7 +21,7 @@ name: kube-prometheus-stack
 sources:
   - https://github.com/prometheus-community/helm-charts
   - https://github.com/prometheus-operator/kube-prometheus
-version: 51.5.1
+version: 51.5.2
 appVersion: v0.68.0
 kubeVersion: ">=1.19.0-0"
 home: https://github.com/prometheus-operator/kube-prometheus

charts/kube-prometheus-stack/templates/thanos-ruler/ruler.yaml

@@ -73,7 +73,8 @@ spec:
 {{- end }}
 {{- if .Values.thanosRuler.thanosRulerSpec.alertmanagersConfig }}
   alertmanagersConfig:
-{{ toYaml .Values.thanosRuler.thanosRulerSpec.alertmanagersConfig | indent 4 }}
+    key: alertmanager-configs.yaml
+    name: {{ template "kube-prometheus-stack.thanosRuler.name" . }}
 {{- end }}
 {{- if .Values.thanosRuler.thanosRulerSpec.queryEndpoints }}
   queryEndpoints:

charts/kube-prometheus-stack/templates/thanos-ruler/secret.yaml

@@ -0,0 +1,14 @@
+{{- if .Values.thanosRuler.enabled }}
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ template "kube-prometheus-stack.thanosRuler.name" . }}
+  namespace: {{ template "kube-prometheus-stack.namespace" . }}
+  labels:
+    app: {{ include "kube-prometheus-stack.thanosRuler.name" . }}
+{{ include "kube-prometheus-stack.labels" . | indent 4 }}
+data:
+{{- if .Values.thanosRuler.thanosRulerSpec.alertmanagersConfig }}
+  alertmanager-configs.yaml: {{ toYaml .Values.thanosRuler.thanosRulerSpec.alertmanagersConfig | b64enc | quote }}
+{{- end }}
+{{- end }}