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chore(docs): add kubernetes compatibility matrix #19

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chore(docs): add kubernetes compatibility matrix #19

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chore(docs): add kubernetes compatibility matrix 
Signed-off-by: Cyril Corbon <corboncyril@gmail.com>
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@cyril-corbon
cyril-corbon committed Mar 5, 2023
commit 1fd5b279fd1b9131a6e508e3f689055c9f4f1171
14 changes: 13 additions & 1 deletion README.md
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- Join Kubernetes slack and join [druid-operator](https://kubernetes.slack.com/archives/C04F4M6HT2L)

### Talks and Blogs on Druid Operator

- [Dok Community](https://www.youtube.com/live/X4A3lWJRGHk?feature=share)
- [Druid Summit](https://youtu.be/UqPrttXRBDg)
- [Druid Operator Blog](https://www.cloudnatively.com/apache-druid-on-kubernetes/)
- [Druid On K8s Without ZK](https://youtu.be/TRYOvkz5Wuw)

### Supported CR

- The operator supports CR of type ```Druid```.
- ```Druid``` CR belongs to api Group ```druid.apache.org``` and version ```v1alpha1```

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![Druid Operator](docs/images/druid-operator.png?raw=true "Druid Operator")

### Notifications

- Users may experience HPA issues with druid-operator with release 0.0.5, as described in the [issue](https://github.com/druid-io/druid-operator/issues/160).
- The latest release 0.0.6 has fixes for the above issue.
- The operator has moved from HPA apiVersion autoscaling/v2beta1 to autoscaling/v2beta2 API users will need to update there HPA Specs according v2beta2 api in order to work with the latest druid-operator release.
- Users may experience pvc deletion [issue](https://github.com/druid-io/druid-operator/issues/186) in release 0.0.6, this issue has been fixed in patch release 0.0.6.1.
- druid-operator has moved Ingress apiVersion networking/v1beta1 to networking/v1. Users will need to update there Ingress Spec in the druid CR according networking/v1 syntax. In case users are using schema validated CRD, the CRD will also be needed to be updated.
- druid-operator has moved PodDisruptionBudget apiVersion policy/v1beta1 to policy/v1. Users will need to update there Kubernetes versions to 1.21+ to use druid-operator tag 0.0.9+.
- The latest release for druid-operator is v1.0.0, this release is compatible with k8s version 1.25. HPA API is kept to version v2beta2.
- The latest release for druid-operator is v1.0.0, this release is compatible with k8s version 1.25. HPA API is kept to version v2beta2.

### Kubernetes version compatibility

| druid-operator | 0.0.9 | v1.0.0 |
| :------------- | :-------------: | :-----: |
| kubernetes <= 1.20 | :x:| :x: |
| kubernetes == 1.21 | :white_check_mark:| :x: |
| kubernetes >= 1.22 and < 1.25 | :white_check_mark: | :white_check_mark: |
| kubernetes > 1.25 | :x: | :white_check_mark: |

### Contributors

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