According to the docs for the <qualified-by> attribute of a <lane>
<!-- ktrace based schemata have an implied "layout-qualifier" column that is --><!-- added to the schema, and plot's will use that implicitly if you don't --><!-- specify a qualified-by element or disable it explicitly by specifying --><!-- disable-implicit-qualifier element. -->Are there anymore details how this layout-qualifier is autocalculated? I'm seeing cases with horrible graph generation due to this layout-qualifier picking a pile of values that don't seem necessary.
Ignore... dumb error on my part where I wasn't closing signposts in all cases generating a pile of layout-qualifiers and not disposing. It would appear that they are done using a thread local variable, which makes sense since that's how I implemented my own version and found the bug 🙂