Batch Support for Ubuntu 22.04 LTS Ending

### Summary

Azure Batch will retire support for Ubuntu 22.04 aligned operating systems to follow the publisher ending standard support on June 30, 2027. If your workload utilizes Batch pools based on this OS, either via Marketplace images (directly from Canonical/microsoft-dsvm or derived from by other publishers) or your own custom images including compute image gallery, then you will need to take action. Please migrate your workload to a publisher supported version of Ubuntu or derivative VM image. After June 30, 2027, Azure Batch will remove support for the `batch.node.ubuntu 22.04` compute node agent. Afterwards, create pool and resize up operations for associated pools may fail. Existing pools may be subject to forced scale in to zero nodes at any point after this date. Customers who continue to use these pools past the indicated Batch support End of Support will be subject to potential security risks.

### Migration possibilities

Please note that any Batch pool specifying the `batch.node.ubuntu 22.04` node agent is subject to end of life.

- If you are utilizing Canonical produced images, Canonical has newer available Ubuntu versions such as 24.04 and 26.04 LTS options available. 26.04 support is forthcoming in Batch.
- If you are utilizing `microsoft-dsvm` published images for either container or HPC functionality, you can migrate to `microsoft-dsvm`:`ubuntu-hpc`:`2404` as an alternative.

Please consult the [List Supported Images API](https://docs.microsoft.com/azure/batch/batch-pool-vm-sizes) for the latest versions available.

### More information

[Azure Batch VM Size and Image Guide](https://docs.microsoft.com/azure/batch/batch-pool-vm-sizes)
[Azure Batch Best Practices](https://docs.microsoft.com/azure/batch/best-practices)