Right now we have a method, IItemCollection#getUnfilteredTimeRanges(), which is basically exposing the set of ranges exposed by the chunk header metadata. This is useful information, but the way it is exposed is a bit nasty.

We should find a way to expose such metadata in a way that isn't polluting the IItemCollection interface, and which doesn't assume JFR as an implementation detail. (Or subclass the interface and add a JFRItemCollection that you can see if it is implemented, and do expose such details).