DISK IGNORE useage

However… if I add to the host’s config a DISK IGNORE /, then while the
text (as above) only shows /tmp, I lose /tmp’s graph line and it only
graphs root.  I’ve tried including the IGNORE line both before and after
a line for /tmp, with no effect.  As soon as I add the IGNORE line,
/tmp’s graph line vanishes on next update.

Try this:

HOST=foo
	DISK %^/$ IGNORE

so you use a regex pattern that only matches "/" to ignore that
filesystem.

I was expecting this to work - but now I have

Filesystem         1024-blocks      Used Available Capacity Mounted on
none                    131072     15456    115616      12% /tmp

and below it, / is graphed.  The graph line for /tmp vanished.  I'm very confused.