I find different notations when googeling for ways to feed unknown values to rrdtool. Things i find are "UNKN", "u", "NaN". I realize it might depend on context and programming language.
My situation: i wrote a perl plugin for collectd (written in c), which uses librrd. What do i need to do in my perl plugin so that "unknown" will turn up in the rrd files? (I realize that collectd sits in the middle, but I assume its only a very thin layer and doesn't meddle with my data.)
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