var go.opencensus.io/metric/metricexport.defaultSampler

2 uses

	go.opencensus.io/metric/metricexport (current package)
		reader.go#L30: 	defaultSampler             = trace.ProbabilitySampler(0.0001)
		reader.go#L91: 	reader := &Reader{defaultSampler, defaultSpanName}