AbstractReturns the elapsed time, in milliseconds since the instance was created
Returns the initial value, or undefined
Returns number of recorded values (this can include the initial value)
Reset tracker
Adds a value, returning computed result.
At this point, we check if the buffer is larger than resetAfterSamples. If so, reset() is called.
If not, we check sampleLimit. If the buffer is twice as large as sample limit, trimStore() is
called to take it down to sample limit, and onTrimmed() is called.
Reduces size of value store to limit. Returns
number of remaining items
Base tracker class