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The following provides a description and cardinality estimation based on the tests in a local cluster: container_blkio_device_usage_total - useful for containers, but not for system services (nodes*disks*services*operations*2) container_fs_.* - add filesystem read/write data (nodes*disks*services*4) container_file_descriptors - file descriptors limits and global numbers are exposed via (nodes*services) container_threads_max - max number of threads in cgroup. Usually for system services it is not limited (nodes*services) container_threads - used threads in cgroup. Usually not important for system services (nodes*services) container_sockets - used sockets in cgroup. Usually not important for system services (nodes*services) container_start_time_seconds - container start. Possibly not needed for system services (nodes*services) container_last_seen - Not needed as system services are always running (nodes*services) container_spec_.* - Everything related to cgroup specification and thus static data (nodes*services*5)