// eachRecordableValue visits each metric in the registry, calling the supplied
// function once for each recordable value represented by that metric. This is
// useful to expand certain metric types (such as histograms) into multiple
// recordable values.
func eachRecordableValue(reg *metric.Registry, fn func(string, float64)) {
reg.Each(func(name string, mtr interface{}) {
if histogram, ok := mtr.(*metric.Histogram); ok {
curr := histogram.Current()
for _, pt := range recordHistogramQuantiles {
fn(name+pt.suffix, float64(curr.ValueAtQuantile(pt.quantile)))
}
} else {
val, err := extractValue(mtr)
if err != nil {
log.Warning(context.TODO(), err)
return
}
fn(name, val)
}
})
}
