[R-pkg-devel] Breaking changes for the XGBoost CRAN package

[jiaming yuan]

Dear CRAN package maintainers,

We would like to reach out to you regarding updates to the XGBoost CRAN package, as you are listed as the maintainer of one or more packages at CRAN that depend on XGBoost.

The next version of XGBoost introduces some breaking changes, which, unfortunately, may result in failing CRAN checks for the package(s) you maintain once the updated version is released on CRAN. In preparation for our next release, please incorporate the necessary fixes into your package and resubmit an updated version to CRAN, ensuring compatibility with the latest XGBoost.

For more details about the changes, please refer to the migration guide at: https://xgboost.readthedocs.io/en/latest/R-package/migration_guide.html . Alongside the documentation for the latest version of XGBoost: https://xgboost.readthedocs.io/en/latest/R-package/index.html . We have published the pre-release package (xgboost-3.1.0) on R-universe for easier testing:

```R
install.packages('xgboost', repos = c('https://dmlc.r-universe.dev', 'https://cloud.r-project.org'))
```

We plan to submit the new version of XGBoost before the end of November.

If you have any questions, comments, or need assistance, please feel free to post them on GitHub: https://github.com/dmlc/xgboost/issues/11430 . The GitHub issue also contains reverse dependency check results for the latest XGBoost.

References:
- R package document: https://xgboost.readthedocs.io/en/latest/R-package/index.html
- Migration guide: https://xgboost.readthedocs.io/en/latest/R-package/migration_guide.html
- API reference: https://xgboost.readthedocs.io/en/latest/r_docs/R-package/docs/reference/index.html
- R universe package: https://dmlc.r-universe.dev/xgboost
- GitHub repository: https://github.com/dmlc/xgboost/
- GitHub tracking issue: https://github.com/dmlc/xgboost/issues/11430

Best regard
Jiaming Yuan

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