# What are the units for the OpenTSDB Rate function?

Let's say I have a byte counter that increments once per second. If I speak, I get a monotonously growing plot. The Y-axis is labeled as "bytes".

I want to calculate the rate at which the counter changes, so I check the "Rate" box. Velocity is change per unit of time, but what unit is it? What label should the Y axis have?

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The Rate function is a function of OpenTSDB requests. According to the OpenTSDB docs

The speed is the first derivative of the values. It is defined as (v2 - v1) / (t2 - t1). Therefore, you will get the rate of change for every second. Currently, the default rate of change in milliseconds is per second.

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