rrd graph does not work (mysql)

I moved my mysql graph definitions in a seperate file (e.g.
$BBHOME/server/etc/hobbit-graph.d/mysql.cfg) and now it works.

My next problem is that not all of my defined marks are shown correctly,
some values show that no values are present ("-nan"). I have for example
a "Queries / second" entry which is shown on one graph but not on the
others (although the graph definitions are show on each). 


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