Salt custom grain to override os_family grain to ensure Rocky Linux is as part of the RedHat OS family.

rocky_os_family.py

#!/usr/bin/env python3

# Override os_family grain to ensure Rocky Linux is seen
# as part of the RedHat OS family.
#
# Similar functionality was added in https://github.com/saltstack/salt/pull/59682
# but has not been released yet.
#
# To install, drop this code into /svc/salt/_grains/ and run
# `salt '*' saltutil.sync_all`

_OS_FAMILY_MAP = {"Rocky Linux": "RedHat"}

def main():
    os_data = {}
    with open("/etc/os-release", "r") as f:
        for line in f.readlines():
            try:
                k, v = line.strip().split("=", 1)
                os_data.update({k: v.replace('"', '')})
            except ValueError:
                continue

    if os_data["NAME"] in _OS_FAMILY_MAP:
        return {"os_family": _OS_FAMILY_MAP[os_data["NAME"]]}

if __name__ == "__main__":
  print(main())