Use Heartbeat extension with HiveMQ Kubernetes Operator

\uD83D\uDCD8 Instructions

Get a local copy of the Helm chart.
This will download the chart of the version $CHART_VERSION and untar it to the subdirectory hivemq-operator:
```
helm pull hivemq/hivemq-operator --version $CHART_VERSION --untar
```
☝️Hint: To download the latest chart version, skip using the option --version $CHART_VERSION. To learn more about chart versions refer to the article HiveMQ Kubernetes Operator Helm chart versions.

Update dependencies in the chart’s directory.
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 hivemq-operator

Hang tight while we grab the latest from your chart repositories...
...Successfully got an update from the "hivemq" chart repository
...Successfully got an update from the "prometheus-community" chart repository
Update Complete. ⎈Happy Helming!⎈
Saving 1 charts
Downloading kube-prometheus-stack from repo https://prometheus-community.github.io/helm-charts
Deleting outdated charts

Edit operator templates, and update the livenessProbe’s declaration.
1. Edit the operator templates:
  1. hivemq-operator/operator-tmpls/cluster-daemon-set.yaml
  2. hivemq-operator/operator-tmpls/cluster-deployment.yaml
  3. 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 of the version $CHART_VERSION:
```
helm show values hivemq/hivemq-operator --version $CHART_VERSION > my-values.yaml
```
☝️ Hint: To download from the latest chart version, skip using the option --version $CHART_VERSION. To learn more about chart versions refer to the article HiveMQ Kubernetes Operator Helm chart versions.

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 hivemq-operator which is containing updated operator templates, and use the updated my-values.yaml:
```
helm upgrade my-hivemq \ 
  --install 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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