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kernel-memory limits are not supported in cgroups v2, and were obsoleted in [kernel v5.4], producing a `ENOTSUP` in kernel v5.16. Support for this option was removed in runc and other runtimes, as various LTS kernels contained a broken implementation, resulting in unpredictable behavior. We deprecated this option in [moby@b8ca7de], producing a warning when used, and actively ignore the option since [moby@0798f5f]. Given that setting this option had no effect in most situations, we should just remove this option instead of continuing to handle it with the expectation that a runtime may still support it. Note that we still support RHEL 8 (kernel 4.18) and RHEL 9 (kernel 5.14). We no longer build packages for Ubuntu 20.04 (kernel 5.4) and Debian Bullseye 11 (kernel 5.10), which still have an LTS / ESM programme, but for those it would only impact situations where a runtime is used that still supports it, and an old API version was used. [kernel v5.4]: https://github.com/torvalds/linux/commit/0158115f702b0ba208ab0 [moby@b8ca7de]:b8ca7de823[moby@0798f5f]:0798f5f5cfSigned-off-by: Sebastiaan van Stijn <github@gone.nl>