a decimal point, a fractional part (decimal digits), and an exponent part
(<code>e</code> or <code>E</code> followed by an optional sign and decimal digits).
One of the integer part or the fractional part may be elided; one of the decimal point
or the exponent part may be elided.
An exponent value exp scales the mantissa (integer and fractional part) by 10<sup>exp</sup>.
</p>

<p>

   * default (or empty string): keep same with before.
   * v2: only backoff retry with Azure SDK with fixed exponent 2.
* Set percentage of nodes scored in each cycle dynamically based on the cluster size. ([#72140](https://github.com/kubernetes/kubernetes/pull/72140), [@wgliang](https://github.com/wgliang))