Add prometheus-operator app

* The configuration for the prometheus-operator may change based on the
cluster size, I could look in to what the posibilities are now or for a
future version.

prometheus-operator/.gitignore

@@ -0,0 +1 @@
+uninstall.sh

prometheus-operator/install.sh

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+#!/bin/bash
+
+NAMESPACE=monitoring
+
+# Create the namespace for prometheus-operator
+kubectl create namespace ${NAMESPACE}
+
+# Create CRDs due to a bug. More information on https://github.com/helm/charts/tree/master/stable/prometheus-operator#helm-fails-to-create-crds
+kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/master/example/prometheus-operator-crd/alertmanager.crd.yaml
+kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/master/example/prometheus-operator-crd/prometheus.crd.yaml
+kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/master/example/prometheus-operator-crd/prometheusrule.crd.yaml
+kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/master/example/prometheus-operator-crd/servicemonitor.crd.yaml
+kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/master/example/prometheus-operator-crd/podmonitor.crd.yaml
+
+# Update your local Helm chart repository cache
+helm repo update
+
+# Install the prometheus-operator Helm chart
+helm install \
+  --name prometheus-operator \
+  --namespace ${NAMESPACE} \
+  --set prometheusOperator.createCustomResource=false \
+  stable/prometheus-operator

prometheus-operator/manifest.yaml

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+---
+name: prometheus-operator
+title: "Prometheus Operator"
+version: Stable
+maintainer: @puck
+description: Prometheus Operator App install prometheus, alertmanager, grafana and other tools to monitor your kubernetes cluster.
+url: https://github.com/coreos/prometheus-operator
+dependencies:
+  - Helm
+category: monitoring

prometheus-operator/post_install.md

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+# Prometheus-Operator
+
+The [prometheus-operator](https://github.com/coreos/prometheus-operator) 
+creates/configures/manages Prometheus clusters atop Kubernetes.
+
+## Details
+
+The prometheus-operator stack is installed in the `monitoring` namespace, to check the pods/services installed use:
+```sh
+kubectl get pods -n monitoring
+kubectl get services -n monitoring
+```
+
+The installed services are:
+* prometheus-operator
+* prometheus
+* alertmanager
+* node-exporter
+* kube-state-metrics
+* grafana
+
+Service monitors to scrape internal kubernetes components:
+* kube-apiserver
+* kube-scheduler
+* kube-controller-manager
+* etcd
+* kube-dns/coredns
+* kube-proxy
+
+
+For further details on this specific installation please see the [Helm chart](https://github.com/helm/charts/tree/master/stable/prometheus-operator).
+
+## Configuration
+
+Visit [prometheus-operator](https://github.com/coreos/prometheus-operator) to learn how to configure Prometheus & Alertmanager.