Add a cgroup repo/project proposal

proposals/cgroups.md

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+# OCI cgroups project proposal
+
+## Abstract
+Having a common cgroups management implementation in OCI for use in and outside
+of runc will ensure long lasting security and interoperability throughout the
+container ecosystem.
+
+## Proposal
+
+Refactor and move cgroups packages out of runc into a separate project:
+
+https://github.com/opencontainers/runc/tree/master/libcontainer/cgroups
+
+The new project would live in the opencontainers github organization:
+
+https://github.com/opencontainers/cgroups
+
+A sample of how the project would look like is already here:
+
+https://github.com/kolyshkin/opencontainers-cgroups
+
+### Initial Maintainers
+Initial maintainers of the cgroups project would be:
+
+* Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp> (@AkihiroSuda)
+* Aleksa Sarai <cyphar@cyphar.com> (@cyphar)
+* Kir Kolyshkin <kolyshkin@gmail.com> (@kolyshkin)
+* Mrunal Patel <mpatel@redhat.com> (@mrunalp)
+* Sebastiaan van Stijn <github@gone.nl> (@thaJeztah)
+* Odin Ugedal <odin@uged.al> (@odinuge)
+* Peter Hunt <pehunt@redhat.com> (@haircommander)
+* Davanum Srinivas <davanum@gmail.com> (@dims)
+
+### Code of Conduct
+This project would incorporate (by reference) the OCI [Code of Conduct][code-of-conduct].
+
+### Governance and Releases
+This project would incorporate the Governance and Releases processes from the
+OCI project template: https://github.com/opencontainers/project-template.
+
+### Project Communications
+The proposed project would continue to use existing channels in use by the OCI
+developer community for communication including:
+* GitHub for issues and pull requests
+* The dev@opencontainers.org email list
+* The weekly OCI developer community conference call
+* The #OpenContainers IRC channel
+
+### Versioning / Roadmap
+
+We'll start with v0.x until everything is stabilized after the split.
+
+The plan is to have frequent releases to accommodate various users.
+
+## Frequently Asked Questions (FAQ)
+*Q: Does this change the OCI Charter or Scope Table?*
+A: No. Nothing in this proposal is intended to amend the
+[OCI Charter](https://www.opencontainers.org/about/governance) or
+[OCI Scope Table](https://www.opencontainers.org/about/oci-scope-table).
+
+*Q: Why move this out of the runc project?*
+A: To be able to reuse this in different container projects, while avoiding
+code duplication and fragmentation. This involves adding functionality and
+cutting releases to accomodate existing users other than runc.
+
+Here's an example: kubernetes needs PSI stats from cgroups, and while the
+low-level functionality needed
+([runc PR #3900](https://github.com/opencontainers/runc/pull/3900))
+was merged in July 2023, it was only made available to kubernetes when runc
+v1.2.0 was tagged in October 2024. Such delays might result in using
+unversioned dependencies, or copying the code around and thus fragmentation.
+
+A longer term goal is make this set of packages even more modular, avoiding
+excessive third-party dependencies.
+
+*Q: Who are the other target users of these packages?*
+
+A: CRI-O, kubernetes, cadvisor.
+
+[code-of-conduct]: https://github.com/opencontainers/org/blob/master/CODE_OF_CONDUCT.md