correctly discover the Alertmanager cluster and ServiceMonitors

README.md

@@ -24,6 +24,7 @@ which manages Prometheus servers and their configuration in a cluster. With a si
 * A Prometheus configuration covering monitoring of all Kubernetes core components and exporters
 * A default set of alerting rules on the cluster component's health
 * A Grafana instance serving dashboards on cluster metrics
+* A three node highly available Alertmanager cluster
 
 Simply run:
 
@@ -35,6 +36,7 @@ hack/cluster-monitoring/deploy
 After all pods are ready, you can reach:
 
 * Prometheus UI on node port `30900`
+* Alertmanager UI on node port `30903`
 * Grafana on node port `30902`
 
 To tear it all down again, run:
@@ -57,7 +59,9 @@ hack/example-service-monitoring/deploy
 ```
 
 After all pods are ready you can reach the Prometheus server on node port `30100` and observe
-how it monitors the service as specified.
+how it monitors the service as specified. Same as before, this Prometheus server automatically
+discovers the Alertmanager cluster deployed in the [Monitoring Kubernetes](#Monitoring-Kubernetes)
+section.
 
 Teardown:
 

hack/cluster-monitoring/deploy

@@ -19,3 +19,4 @@ until kctl get prometheus; do sleep 1; done
 kctl apply -f manifests/exporters
 kctl apply -f manifests/grafana
 kctl apply -f manifests/prometheus
+kctl apply -f manifests/alertmanager

hack/cluster-monitoring/teardown

@@ -11,6 +11,7 @@ kctl() {
 kctl delete -f manifests/exporters
 kctl delete -f manifests/grafana
 kctl delete -f manifests/prometheus
+kctl delete -f manifests/alertmanager
 
 # Hack: wait a bit to let the controller delete the deployed Prometheus server.
 sleep 5

manifests/examples/example-app/prometheus-frontend.yaml

@@ -7,10 +7,9 @@ metadata:
     prometheus: frontend
 spec:
   version: v1.4.1
-  serviceMonitors:
-  - selector:
-      matchLabels:
-        tier: frontend
+  serviceMonitorSelector:
+    matchLabels:
+      tier: frontend
   resources:
     requests:
       # 2Gi is default, but won't schedule if you don't have a node with >2Gi

manifests/prometheus/prometheus-k8s-cm.yaml

@@ -1,6 +1,25 @@
 apiVersion: v1
 data:
   prometheus.yaml: |
+    alerting:
+      alertmanagers:
+      - kubernetes_sd_configs:
+        - role: endpoints
+        relabel_configs:
+        - action: keep
+          regex: alertmanager-main
+          source_labels:
+          - __meta_kubernetes_service_name
+        - action: keep
+          regex: monitoring
+          source_labels:
+          - __meta_kubernetes_namespace
+        - action: keep
+          regex: web
+          source_labels:
+          - __meta_kubernetes_endpoint_port_name
+        scheme: http
+
     global:
       scrape_interval: 15s
       evaluation_interval: 15s

manifests/prometheus/prometheus-k8s.yaml

@@ -13,8 +13,3 @@ spec:
       # production use. This value is mainly meant for demonstration/testing
       # purposes.
       memory: 400Mi
-  alerting:
-    alertmanagers:
-    - namespace: monitoring
-      name: alertmanager-main
-      port: web