An audit container ID proposal

The kernel development community has consistently resisted adding any formal notion of what a "container" is to the kernel. While the needed building blocks (namespaces, control groups, etc.) are provided, it is up to user space to assemble the pieces into the sort of container implementation it needs. This approach maximizes flexibility and makes it possible to implement a number of different container abstractions, but it also can make it hard to associate events in the kernel with the container that caused them. Audit container IDs are an attempt to fix that problem for one specific use case; they have not been universally well received in the past, but work on this mechanism continues regardless.

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