addons: Update Prometheus from v2.1.0 to v2.2.0

* Annotate Prometheus service to scrape metrics from
Prometheus itself (enables Prometheus* alerts)
* Update kube-state-metrics addon-resizer to 1.7
* Use port 8080 for kube-state-metrics
* Add PrometheusNotIngestingSamples alert rule
* Change K8SKubeletDown alert rule to fire when 10%
of kubelets are down, not 1%
  * https://github.com/coreos/prometheus-operator/pull/1032

addons/prometheus/deployment.yaml

@@ -18,7 +18,7 @@ spec:
       serviceAccountName: prometheus
       containers:
       - name: prometheus
-        image: quay.io/prometheus/prometheus:v2.1.0
+        image: quay.io/prometheus/prometheus:v2.2.0-rc.1
         args:
           - '--config.file=/etc/prometheus/prometheus.yaml'
         ports:

addons/prometheus/exporters/kube-state-metrics/deployment.yaml

@@ -33,7 +33,7 @@ spec:
           initialDelaySeconds: 5
           timeoutSeconds: 5
       - name: addon-resizer
-        image: gcr.io/google_containers/addon-resizer:1.0
+        image: gcr.io/google_containers/addon-resizer:1.7
         resources:
           limits:
             cpu: 100m
@@ -54,8 +54,8 @@ spec:
           - /pod_nanny
           - --container=kube-state-metrics
           - --cpu=100m
-          - --extra-cpu=2m
+          - --extra-cpu=1m
-          - --memory=150Mi
+          - --memory=100Mi
-          - --extra-memory=30Mi
+          - --extra-memory=2Mi
           - --threshold=5
           - --deployment=kube-state-metrics

addons/prometheus/exporters/kube-state-metrics/service.yaml

@@ -15,5 +15,5 @@ spec:
   ports:
     - name: metrics
       protocol: TCP
-      port: 80
+      port: 8080
       targetPort: 8080

addons/prometheus/rules.yaml

@@ -353,7 +353,7 @@ data:
           description: Prometheus failed to scrape {{ $value }}% of kubelets.
       - alert: K8SKubeletDown
         expr: (absent(up{job="kubelet"} == 1) or count(up{job="kubelet"} == 0) / count(up{job="kubelet"}))
-          * 100 > 1
+          * 100 > 10
         for: 1h
         labels:
           severity: critical
@@ -588,3 +588,11 @@ data:
           description: '{{$labels.job}} at {{$labels.instance}} has a corrupted write-ahead
             log (WAL).'
           summary: Prometheus write-ahead log is corrupted
+      - alert: PrometheusNotIngestingSamples
+        expr: rate(prometheus_tsdb_head_samples_appended_total[5m]) <= 0
+        for: 10m
+        labels:
+          severity: warning
+        annotations:
+          description: "Prometheus {{ $labels.namespace }}/{{ $labels.pod}} isn't ingesting samples."
+          summary: "Prometheus isn't ingesting samples"

addons/prometheus/service.yaml

@@ -3,6 +3,8 @@ kind: Service
 metadata:
   name: prometheus
   namespace: monitoring
+  annotations:
+    prometheus.io/scrape: 'true'
 spec:
   type: ClusterIP
   selector: