Metric

A specific metric, identified by specifying values for all of the labels of a MetricDescriptor.

JSON representation 
{
  "type": string,
  "labels": {
    string: string,
    ...
  }
}
Fields
type

string

An existing metric type, see google.api.MetricDescriptor. For example, custom.googleapis.com/invoice/paid/amount.
labels

map (key: string, value: string)

The set of label values that uniquely identify this metric. All labels listed in the MetricDescriptor must be assigned values.