So we end up with :
forever
read value
if value > min
reset counter
reset timer
write T:value to rrd
writeT+1:0 to rrd
else
if timer > some_period
write T:0 to rrd
reset timer
sleep for a bit
go back and do it all again
Not quite. I think you are mixing two different solutions.
Option 1: don't reset the counter every time it is read. The counter will
reset itself just after midnight. In this case use DERIVE and optionally do
write that zero. Writing the zero is optional, it will help a bit in
preventing an unknown at the beginning of each day.
Option 2: (if possible) reset the counter every time it changed. This means
using ABSOLUTE as counter type. Write the appropriate amount to RRD. Do not
write an extra zero to the rrd, this is already taken care of by using
ABSOLUTE.
But yes, something does need to be done before the hearbeat timer expires,
in both cases.
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