As discussed in CASSANDRA-17148, a first step for the integration between guardrails and track warnings is merging their configurations, which are almost identical. This ticket would cover merging their config sections in cassandra.yaml and their corresponding JMX getters and setters. A tighter integration between the internals of both features wouldn't be part of this ticket, but of either CASSANDRA-17148 or a new subtask of it.
Neither guardrails nor track warnings have included in any release, so it would be desirable to do this before releasing 4.1 so we don't have to deprecate properties.
There's an ongoing discussion about refactoring cassandra.yaml spread across CASSANDRA-17292,
CASSANDRA-17188 and CASSANDRA-17212. I understand that any change affecting the config for guardrails also affects the config track warnings, because they are almost identical. Thus, I think that merging both config sections would ease any refactoring plan that is agreed on that discussion.