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fix (cgroups): already dead edge case
Certain kubernetes version make use of short lived cgroups for various tasks (for example log rotation). These cgroups will generate events and a very quick cgroup_rmdir event. As such, many related events to the cgroup will attempt to query its directory through the recursive path and not find it. Commit adds a "Dead" field to the cgroup info to indicate a cgroup which has already been removed. Various logical sections can refer to it if its relevant to them, and more importantly, additional queries will not be attempted.
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