Use Heartbeat extension with HiveMQ Kubernetes Operator

\uD83D\uDCD8 Instructions

Clone the repo with hivemq-operator charts locally.
This will create a local copy of the charts saved to the helm-charts subdirectory.
```
git clone https://github.com/hivemq/helm-charts.git
```
```
tree -L 1
 .
 └── helm-charts
```
Update dependencies.
This command verifies that the required charts, as expressed in 'Chart.yaml', are present in 'charts/' and are at an acceptable version. It will pull down the latest charts that satisfy the dependencies, and clean up old dependencies.
```
helm dependencies update helm-charts/charts/hivemq-operator
```
Edit operator templates, and update the livenessProbe’s declaration.
1. Edit the operator templates:
  1. helm-charts/charts/hivemq-operator/operator-tmpls/cluster-daemon-set.yaml
  2. helm-charts/charts/hivemq-operator/operator-tmpls/cluster-deployment.yaml
  3. helm-charts/charts/hivemq-operator/operator-tmpls/cluster-stateful-set.yaml
2. Find the existing declaration of the livenessProbe:
```
livenessProbe:
  tcpSocket:
    port: {{ util:getPort(spec, "mqtt").port }}
  initialDelaySeconds: 15
  periodSeconds: 30
  failureThreshold: 240
```
3. Replace with the new declaration of the livenessProbe:
```
livenessProbe:
  httpGet:
    path: /heartbeat
    port: {{ util:getPort(spec, "heartbeat").port }}
  initialDelaySeconds: 30
  periodSeconds: 15
  failureThreshold: 240
```

Get the values.yaml file for the hivemq-operator:

helm show values hivemq/hivemq-operator > my-values.yaml

Edit the my-values.yaml file:

Add the heartbeat extension to the end of the hivemq.extensions array:

hivemq:
  ...
  extensions:
    ...
    ...    
    - name: hivemq-heartbeat-extension
      extensionUri: https://github.com/hivemq/hivemq-heartbeat-extension/releases/download/1.0.4/hivemq-heartbeat-extension-1.0.4.zip
      enabled: true

Add the heartbeat port to the end of the hivemq.ports array:

hivemq:
  ...
  ports:
    ...
    ...
    - name: "heartbeat"
      port: 9090
      expose: true

Using Helm, install hivemq-operator from the local directory containing updated operator templates and use the updated my-values.yaml:
```
helm upgrade my-hivemq \ 
  --install helm-charts/charts/hivemq-operator \ 
  --values my-values.yaml 
```
When the hivemq-operator and hivemq pods are ready, monitor the event.log:
```
kubectl exec pod/my-hivemq-abcdefgh -- tail -f log/event.log
```

Use Heartbeat extension with HiveMQ Kubernetes Operator

\uD83D\uDCD8 Instructions

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