MetricValue

  • A metric value can be exact or estimated, representing a count with an expected value and variance.

  • The value field is a string representing the expected metric value.

  • The variance field is a string representing the variance of the metric value, which is 0 if the value is exact.

  • Variance can be used to calculate the margin of error for estimated values.

A metric value, with an expected value and a variance; represents a count that may be either exact or estimated (for example, when sampled).

JSON representation 
{
  "value": string,
  "variance": string
}
Fields
value

string (int64 format)

The expected value of the metric.
variance

string (int64 format)

The variance (for example, square of the standard deviation) of the metric value. If value is exact, variance is 0. Can be used to calculate margin of error as a percentage of value, using the following formula, where Z is the standard constant that depends on the preferred size of the confidence interval (for example, for 90% confidence interval, use Z = 1.645):

marginOfError = 100 * Z * sqrt(variance) / value