Constant KTSTR_HOST_CGROUP_PARENT_ENV 

pub const KTSTR_HOST_CGROUP_PARENT_ENV: &str = "KTSTR_HOST_CGROUP_PARENT";

Name of the environment variable that overrides the default host-mode cgroup parent (where host_only tests’ workload cgroups land). Empty / unset falls back to the canonical default; a non-empty value must be rooted under /sys/fs/cgroup and name a non-root subdirectory.

Single source of truth so the name is not spelled by hand at each reader. Mirrors the sibling KTSTR_KERNEL_ENV / KTSTR_KERNEL_LIST_ENV / KTSTR_KERNEL_PARALLELISM_ENV / KTSTR_VERIFIER_RAW_ENV / KTSTR_ORCHESTRATED_ENV constant-defined naming convention; a single grep across KTSTR_*_ENV consts gives the operator the complete env-var inventory.

Read by crate::test_support::dispatch::resolve_host_cgroup_parent.