May 2026 monthly summary for Katello/katello focusing on the Candlepin status caching work during registration. Delivered a Redis-backed cache for Candlepin status with a 180-second TTL to reduce redundant API calls in the registration flow and to align with the server timeout. Added safeguards to prevent caching errors when Candlepin is down and ensured errors are not cached. Reused the same cache key for pre-flight registration checks, improving consistency across registration steps. Restored and reinforced before_actions (check_registration_services) in CandlepinProxiesController and HostSubscriptionsController, with cache invalidation on registration failure for fast error detection. This work improves registration speed, reduces backend load, and strengthens fault tolerance in the presence of Candlepin outages.

October 2025: Delivered a targeted documentation and deployment procedure improvement to ensure MQTT tuning persists across foreman-installer runs by leveraging a custom-hiera configuration. The change updates /etc/foreman-installer/custom-hiera.yaml to set LimitNOFILE for mosquitto.service and re-runs the installer to apply the setting.