Another bug in collectd graphs. The DS name for the entropy graph has been changed in collectd from 'entropy' to 'value'.
entropy DS name is value.
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Do we need to do a check for collectd version first to see which names to use?
I can see they changed it in 2010 but don't want to break existing installations for those it may be working for. If it's very unlikely that people will be running such an old version then I guess we could switch.
It looks like the first release with this change was in collectd 5.0 released 2011-03-28. If you think it'd be appropriate to add a note to the configuration document that collectd 5.0 or greater is required I'd be happy to do that.
Otherwise I suppose it would need to call rrdtool info to check wether it has the DS 'entropy' or 'value'.
I can see f0o merged a similar change and 2011 is old enough I'd say.