[docs] Example of using official prometheus helm chart to deploy server with sidecar

docs/getting_started.md

@@ -77,6 +77,7 @@ If you are not interested in backing up any data, the `--objstore.config-file` f
 
 * _[Example Kubernetes manifest](../tutorials/kubernetes-demo/manifests/prometheus-ha-sidecar.yaml)_
 * _[Example Kubernetes manifest with Minio upload](../tutorials/kubernetes-demo/manifests/prometheus-ha-sidecar-lts.yaml)_
+* _[Example Deploying sidecar using official Prometheus Helm Chart](../tutorials/kubernetes-helm/README.md)_
 * _[Details & Config for other object stores](./storage.md)_
 
 ### [Store API](/pkg/store/storepb/rpc.proto#L19)

tutorials/kubernetes-helm/README.md

@@ -0,0 +1,154 @@
+To deploy thanos sidecar along with Prometheus using official helm chart - just run the next command, putting the values to a file `values.yaml` and changing `--namespace` value beforehand:
+
+```
+helm upgrade --version="8.6.0" --install --namespace="my-lovely-namespace" --values values.yaml  prometheus-thanos-sidecar stable/prometheus
+```
+
+Take a note that you need to replace two placeholders in the values: `BUCKET_REPLACE_ME` and `CLUSTER_NAME`. Also adjust all the other values according to your infrastructure requirements.
+
+An example of the `values.yaml` file:
+```
+rbac:
+  create: true
+
+alertmanager:
+  enabled: false
+
+pushgateway:
+  enabled: false
+
+nodeExporter:
+  enabled: false
+
+kubeStateMetrics:
+  enabled: false
+
+initChownData:
+  resources:
+    limits:
+      memory: 16Mi
+      cpu: 50m
+    requests:
+      memory: 16Mi
+      cpu: 50m
+
+server:
+  extraArgs:
+    log.level: debug
+    storage.tsdb.min-block-duration: 2h  # Don't change this, see docs/components/sidecar.md
+    storage.tsdb.max-block-duration: 2h  # Don't change this, see docs/components/sidecar.md
+  retention: 4h
+  service:
+    annotations:
+       prometheus.io/scrape: "true"
+       prometheus.io/port: "9090"
+  statefulSet:
+    enabled: true
+  podAnnotations:
+    prometheus.io/scrape: "true"
+    prometheus.io/port: "10902"
+  affinity:
+    podAntiAffinity:
+      requiredDuringSchedulingIgnoredDuringExecution:
+      - labelSelector:
+          matchExpressions:
+          - key: app
+            operator: In
+            values:
+            - prometheus
+          - key: component
+            operator: In
+            values:
+            - server
+        topologyKey: "kubernetes.io/hostname"
+  sidecarContainers:
+  - name: thanos-sidecar
+    # Always use explicit image tags (release or master-<date>-sha) instead of ambigous `latest` or `master`.
+    image: improbable/thanos:v0.3.2
+    resources:
+      requests:
+        memory: "4Gi"
+        cpu: "2"
+      limits:
+        memory: "4Gi"
+        cpu: "2"
+    env:
+    - name: GOOGLE_APPLICATION_CREDENTIALS
+      value: /etc/secret/sa
+    args:
+    - "sidecar"
+    - "--log.level=debug"
+    - "--tsdb.path=/data/"
+    - "--prometheus.url=http://127.0.0.1:9090"
+    - "--cluster.disable"
+    - "--objstore.config={type: GCS, config: {bucket: BUCKET_REPLACE_ME}}"
+    - "--reloader.config-file=/etc/prometheus-config/prometheus.yml"
+    - "--reloader.config-envsubst-file=/etc/prometheus-shared/prometheus.yml"
+    - "--reloader.rule-dir=/etc/prometheus-config/rules"
+    ports:
+    - name: sidecar-http
+      containerPort: 10902
+    - name: grpc
+      containerPort: 10901
+    - name: cluster
+      containerPort: 10900
+    volumeMounts:
+    - name: storage-volume
+      mountPath: /data
+    - name: thanos-storage-secret
+      mountPath: /etc/secret
+    - name: config-volume
+      mountPath: /etc/prometheus-config
+      readOnly: false
+    - name: prometheus-config-shared
+      mountPath: /etc/prometheus-shared/
+      readOnly: false
+  configPath: /etc/prometheus-shared/prometheus.yml
+  replicaCount: 2
+  persistentVolume:
+    size: 100Gi
+  extraVolumes:
+  - name: prometheus-config-shared
+    emptyDir: {}
+  extraVolumeMounts:
+  - name: prometheus-config-shared
+    mountPath: /etc/prometheus-shared/
+  resources:
+    limits:
+      cpu: 4
+      memory: 20Gi
+    requests:
+      cpu: 4
+      memory: 20Gi
+  global:
+    scrape_interval: 5s
+    scrape_timeout: 4s
+    external_labels:
+      prometheus_group: CLUSTER_NAME
+      prometheus_replica: '$(HOSTNAME)'
+    evaluation_interval: 5s
+  extraSecretMounts:
+  - name: thanos-storage-secret
+    mountPath: /etc/secret/
+    subPath: sa
+    readOnly: false
+    secretName: thanos-storage-secret
+
+configmapReload:
+  image:
+    repository: gcr.io/google-containers/pause-amd64 # This image changed to just pause since there's no option to disable configmapReload container in chart, but thanos-sidecar overtakes this functionality. So basically we don't need another reloader
+    tag: 3.1
+  resources:
+    limits:
+      cpu: 20m
+      memory: 20Mi
+    requests:
+      cpu: 20m
+      memory: 20Mi
+
+
+serverFiles:
+  alerts: {}
+  rules: {}
+
+```