addons: Add better alerting rules to Prometheus manifests

* Adapt the coreos/prometheus-operator alerting rules for Typhoon,
https://github.com/coreos/prometheus-operator/tree/master/contrib/kube-prometheus/manifests
* Add controller manager and scheduler shim services to let
prometheus discover them via service endpoints
* Fix several alert rules to use service endpoint discovery
* A few rules still don't do much, but they default to green

addons/prometheus/discovery/kube-controller-manager.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: kube-controller-manager
+  namespace: kube-system
+  annotations:
+    prometheus.io/scrape: 'true'
+spec:
+  type: ClusterIP
+  # service is created to allow prometheus to scrape endpoints
+  clusterIP: None
+  selector:
+    k8s-app: kube-controller-manager
+  ports:
+    - name: metrics
+      protocol: TCP
+      port: 10252
+      targetPort: 10252

addons/prometheus/discovery/kube-scheduler.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: kube-scheduler
+  namespace: kube-system
+  annotations:
+    prometheus.io/scrape: 'true'
+spec:
+  type: ClusterIP
+  # service is created to allow prometheus to scrape endpoints
+  clusterIP: None
+  selector:
+    k8s-app: kube-scheduler
+  ports:
+    - name: metrics
+      protocol: TCP
+      port: 10251
+      targetPort: 10251