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Merge pull request #10076 from mtfoley/docs-deriv 

docs: update function docs on deriv
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Björn Rabenstein 2022-08-11 11:49:21 +02:00 committed by GitHub
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@ -136,6 +136,8 @@ delta(cpu_temp_celsius{host="zeus"}[2h])
`deriv(v range-vector)` calculates the per-second derivative of the time series in a range
vector `v`, using [simple linear regression](https://en.wikipedia.org/wiki/Simple_linear_regression).
The range vector must have at least two samples in order to perform the calculation. When `+Inf` or
`-Inf` are found in the range vector, the slope and offset value calculated will be `NaN`.
`deriv` should only be used with gauges.
@ -335,6 +337,9 @@ January etc.
`predict_linear(v range-vector, t scalar)` predicts the value of time series
`t` seconds from now, based on the range vector `v`, using [simple linear
regression](https://en.wikipedia.org/wiki/Simple_linear_regression).
The range vector must have at least two samples in order to perform the
calculation. When `+Inf` or `-Inf` are found in the range vector,
the slope and offset value calculated will be `NaN`.
`predict_linear` should only be used with gauges.