I’m trying to understand the rollover concept with the aggregator.derivative
plugin.
Can someone please explain the math on how you get .33 when period = "7s"
from the example provided in the documentation?
I’m trying to understand the rollover concept with the aggregator.derivative
plugin.
Can someone please explain the math on how you get .33 when period = "7s"
from the example provided in the documentation?
Hmm I’m not sure. Based on a quick reading of this I would have expected the following calculations:
# max_roll_over = 0
(8-8) / (14-7) = 0
# max_roll-over = 1
(8-6) / (14-7) = 0.2857...?
Is that what you thought as well?
I think this is how its being calculated:
# max_roll_over = 1
(8-6) / (13 - 7) = .33...
Ah that makes the math work. My thinking was since it was using a period of “7s” it would use 7 and 14. In which case the math is wrong.
I would like to update that table with the explanation, seen on the other tables and I am inclined to update the result of that max_roll_over = 1
example. Thoughts?
Yea, I think that’s a good idea.
I put up a PR and in doing so realized the example at time period 7 didn’t look right either: docs(aggregators.derivative): add explanation of calculations by powersj · Pull Request #12758 · influxdata/telegraf · GitHub
Does that look closer to what you expect?
Yes, looks good. Thank you!