Description:
It reads collector output in standard form from stdin and updates the
appropriate RRDs. It wants to know which collector the information came
from to avoid looking for information that won't be there.
It is responsible for figuring out which value belongs to which RRD and
variable. It is also responsible for applying any functions to that
value. It also implements the FAKE
function, see the docs for the
rrds config-dir.
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