CHI-in-a-Box comes with several automated periodic tasks called "hammers", which are intended to "whack" (technical term) precise parts of the system back in to place, typically to resolve issues of state disagreements between some of the distributed services. Hammers also are and can be used for policy enforcement, e.g., terminating leases that are made but then never utilized.
The hammers repository goes into more detail about what each of these hammers does, and why they exist.
Listing all hammers
Hammers are by default installed onto the control node in the site configuration Ansible inventory. This is usually the node that runs the bulk of the services. You can list all the installed hammers by enumerating the systemd timers.
systemctllist-timers'hammer_*'
NEXT LEFT LAST PASSED UNIT ACTIVATES
Thu 2020-10-08 20:02:09 CDT 47min left Thu 2020-10-08 19:08:34 CDT 5min ago hammer_unutilized_leases.timer hammer_unutilized_leases.service
Thu 2020-10-08 20:14:42 CDT 1h 0min left n/a n/a hammer_ironic_error_resetter.timer hammer_ironic_error_resetter.service
Fri 2020-10-09 00:16:17 CDT 5h 2min left n/a n/a hammer_orphan_resource_providers.timer hammer_orphan_resource_providers.service
Fri 2020-10-09 00:17:18 CDT 5h 3min left n/a n/a hammer_reservation_usage_notification.timer hammer_reservation_usage_notification.service
Fri 2020-10-09 00:37:31 CDT 5h 23min left n/a n/a hammer_orphans_detector.timer hammer_orphans_detector.service
Fri 2020-10-09 00:38:04 CDT 5h 23min left n/a n/a hammer_clean_old_aggregates.timer hammer_clean_old_aggregates.service
Fri 2020-10-09 01:03:47 CDT 5h 49min left n/a n/a hammer_dirty_ports.timer hammer_dirty_ports.service
Fri 2020-10-09 01:44:43 CDT 6h left n/a n/a hammer_floating_ip_reaper.timer hammer_floating_ip_reaper.service
Fri 2020-10-09 01:45:51 CDT 6h left n/a n/a hammer_conflict_macs.timer hammer_conflict_macs.service
Fri 2020-10-09 02:13:57 CDT 6h left n/a n/a hammer_undead_instances.timer hammer_undead_instances.service
Fri 2020-10-09 02:39:30 CDT 7h left n/a n/a hammer_lease_stacking.timer hammer_lease_stacking.service
Fri 2020-10-09 02:57:16 CDT 7h left n/a n/a hammer_enforce_node_retirement.timer hammer_enforce_node_retirement.service
Inspecting hammer output
The hammers will generally output information about what they have done to stdout. This is captured by the systemd journal, so you can track down events that may be of interest.
# Inspect output for the "clean old aggregates" hammerjournalctl-uhammer_clean_old_aggregates