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[metricbeat] add notice about breaking change #397

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[metricbeat] add notice about breaking change #397

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3 changes: 3 additions & 0 deletions CHANGELOG.md
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### Metricbeat

**Warning**
[#352](https://github.com/elastic/helm-charts/pull/352) is introducing a breaking change, please refer to [Metricbeat Breaking Changes](./metricbeat/README.md#breaking-changes) section for users upgrading from a chart version < 7.5.0.

| PR | Author | Title |
| ------------------------------------------------------ | ------------------------------------------------ | ----------------------------------------------------------------------------------------- |
|[#352](https://github.com/elastic/helm-charts/pull/352) | [@masterkain](https://github.com/masterkain) | Bump kube-state-metrics to latest chart and app version |
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14 changes: 14 additions & 0 deletions metricbeat/README.md
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Expand Up @@ -4,6 +4,20 @@ This functionality is in beta and is subject to change. The design and code is l

This helm chart is a lightweight way to configure and run our official [Metricbeat docker image](https://www.elastic.co/guide/en/beats/metricbeat/current/running-on-docker.html).

## Breaking Changes

[7.5.0](https://github.com/elastic/helm-charts/releases/tag/7.5.0) release is introducing a breaking change for Metricbeat users upgrading from a previous chart version.
The breaking change tracked in [#395](https://github.com/elastic/helm-charts/issues/395) is failing `helm upgrade` command with the following error:
```
UPGRADE FAILED
Error: Deployment.apps "metricbeat-kube-state-metrics" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app.kubernetes.io/name":"kube-state-metrics"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable && Deployment.apps "metricbeat-metricbeat-metrics" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app":"metricbeat-metricbeat-metrics", "chart":"metricbeat-7.5.0", "heritage":"Tiller", "release":"metricbeat"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable
Error: UPGRADE FAILED: Deployment.apps "metricbeat-kube-state-metrics" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app.kubernetes.io/name":"kube-state-metrics"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable && Deployment.apps "metricbeat-metricbeat-metrics" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app":"metricbeat-metricbeat-metrics", "chart":"metricbeat-7.5.0", "heritage":"Tiller", "release":"metricbeat"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable
```

This is caused by the update of [kube-state-metrics](https://github.com/helm/charts/tree/master/stable/kube-state-metrics) chart dependency which is renaming some labels in [helm/charts#15261](https://github.com/helm/charts/pull/15261).

The workaround is to use `--force` argument for `helm upgrade` command which will force Metricbeat resources update through delete/recreate.

## Requirements

* Kubernetes >= 1.9
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