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[22706] Warn about XTypes in Fast DDS v3 (backport #5601) #5603

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[22706] Warn about XTypes in Fast DDS v3 (backport #5601) #5603

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This document aims to help during the migration process from eProsima *Fast DDS version* 2 to *Fast DDS version* 3.
For more information about all the updates, please refer to the [release notes](https://fast-dds.docs.eprosima.com/en/latest/notes/notes.html).

> [!WARNING]
> Fast DDS v3 introduces a new feature [XTypes](https://fast-dds.docs.eprosima.com/en/latest/fastdds/xtypes/xtypes.html#xtypes) that allows to discover remote types.
> In consequence, discovery traffic can be increased during start up.
> If you are experiencing high load during discovery, try disabling the new feature.
> Please refer to [disable type propagation](https://fast-dds.docs.eprosima.com/en/latest/fastdds/property_policies/non_consolidated_qos.html#type-propagation) to learn how to do it.

## Migration Steps

The following steps describe the possible changes that your project may require to migrate to *Fast DDS v3.0.0*:
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