contrib: add Thanos example manifests

manifests/thanos/prometheus-self.yaml

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+apiVersion: monitoring.coreos.com/v1
+kind: Prometheus
+metadata:
+  name: self
+  labels:
+    prometheus: self
+spec:
+  podMetadata:
+    labels:
+      thanos-peer: 'true'
+  replicas: 2
+  version: v2.2.1
+  serviceAccountName: prometheus-k8s
+  serviceMonitorSelector:
+    matchLabels:
+      app: prometheus
+  ruleSelector:
+    matchLabels:
+      role: prometheus-rulefiles
+      prometheus: k8s
+  resources:
+    requests:
+      # 2Gi is default, but won't schedule if you don't have a node with >2Gi
+      # memory. Modify based on your target and time-series count for
+      # production use. This value is mainly meant for demonstration/testing
+      # purposes.
+      memory: 400Mi
+  containers:
+  - name: thanos 
+    image: improbable/thanos:latest
+    args:
+    - "sidecar"
+    - "--log.level=debug"
+    - "--cluster.peers=thanos-peers.default.svc:10900"
+    ports:
+    - name: http
+      containerPort: 10902
+    - name: grpc
+      containerPort: 10901
+    - name: cluster
+      containerPort: 10900
+---
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: prometheus
+  labels:
+    app: prometheus
+spec:
+  selector:
+    matchLabels:
+      app: prometheus
+  endpoints:
+  - port: web
+    interval: 30s
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: prometheus
+    prometheus: self
+  name: prometheus-self
+spec:
+  type: NodePort
+  ports:
+  - name: web
+    nodePort: 30900
+    port: 9090
+    protocol: TCP
+    targetPort: web
+  selector:
+    prometheus: self

manifests/thanos/query.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: thanos-query
+  labels:
+    app: thanos-query
+    thanos-peer: "true"
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: thanos-query
+      thanos-peer: "true"
+  template:
+    metadata:
+      labels:
+        app: thanos-query
+        thanos-peer: "true"
+    spec:
+      containers:
+      - name: thanos-query
+        image: improbable/thanos:latest
+        args:
+        - "query"
+        - "--log.level=debug"
+        - "--query.replica-label=prometheus_replica"
+        - "--cluster.peers=thanos-peers.default.svc:10900"
+        ports:
+        - name: http
+          containerPort: 10902
+        - name: grpc
+          containerPort: 10901
+        - name: cluster
+          containerPort: 10900
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: thanos-query
+  name: thanos-query
+spec:
+  type: NodePort
+  selector:
+    app: thanos-query
+  ports:
+  - port: 9090
+    protocol: TCP
+    targetPort: http
+    name: http-query
+    nodePort: 31111

manifests/thanos/thanos-peers-svc.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: thanos-peers
+spec:
+  type: ClusterIP
+  clusterIP: None
+  ports:
+  - name: cluster
+    port: 10900
+    targetPort: cluster
+  selector:
+    # Useful endpoint for gathering all thanos components for common gossip cluster.
+    thanos-peer: "true"