Hey Micheál,
Runbooks have retention policies that are separate from the Lifecycle retention policies, so you’re right they’re not linked to Lifecycles.
If you’re looking for where to configure the runbook retention policies, you can find these under Project > Runbook > Settings > Retention Policy:
Unfortunately there isn’t a way via the UI to globally configure this setting, but this could be done via the REST API. The following help post demonstrates how to do this:
https://help.octopus.com/t/can-i-set-a-global-runbook-retention-policy/25577/2
I hope that’s helpful, but let me know if you were looking for something else or if I didn’t fully answer your question.
Best,
Patrick