I have a number of Rules that are run from within other Rules.
I am upgrading/rewriting v5.0 rules to v5.1.
So before rewriting a Rule I want to determine which other Rules invoke it.
Something like the list of In Use By for Devices..
I don't know if there is anything automatic that does it, but there is a Notes field in RM that you could fill in yourself after tracking down all the connections between rules, then maintain it from that point on.
I know there have been plenty of times I have wished for this. Something like the way the devices show what rules are attached to it; it would be nice to know what rule is linked to another rule.
In my case I have many single run rules (i.e. bulb on, bulb off, bulb flash) without triggers and then other rules that do have the logic/triggers set in them that say run rule x. If a device or action gets broken in a subrule, it is sometimes difficult to go through all my other rules to find out what other rule is now broken.
I would add a +1 to a feature request containing this.