What is the power of irate?

Question

Monitoring

According to the documentation it says that

irate is based on the last two data points

I can’t understand what this means, that is, for the entire interval that I took in irate, it is based on only 2 points?
And on what?

Answer 1

irate is based on the last two data points.
Literally - the last two. Those. the calculation uses the last 2 values ​​of the selected time series, all others are ignored.
What is the strength - well suited for momentary metrics (not charts) and for rapidly changing values ​​\u200b\u200bthat stick together often.
PS I myself have not yet found the use of this function in practice