check_docker
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Support Docker running under CGroups v1 and v2
Docker supports either CGroups v1 or v2 and while running under v2 the memory stat details change slightly. To account for FS cache we need to subtract out memory_stats.stats.inactive_file instead of memory_stats.stats.total_cache under v1.
We found this despondency when running the latest dockerd on Debian Bullseye.