kubernetes/vendor/github.com/prometheus/procfs/proc_cgroup.go

type Cgroup …

// parseCgroupString parses each line of the /proc/[pid]/cgroup file
// Line format is hierarchyID:[controller1,controller2]:path.
func parseCgroupString(cgroupStr string) (*Cgroup, error) { … }

// parseCgroups reads each line of the /proc/[pid]/cgroup file.
func parseCgroups(data []byte) ([]Cgroup, error) { … }

// Cgroups reads from /proc/<pid>/cgroups and returns a []*Cgroup struct locating this PID in each process
// control hierarchy running on this system. On every system (v1 and v2), all hierarchies contain all processes,
// so the len of the returned struct is equal to the number of active hierarchies on this system.
func (p Proc) Cgroups() ([]Cgroup, error) { … }