const go.opencensus.io/metric/metricdata.AttachmentKeySpanContext

2 uses

	go.opencensus.io/metric/metricdata (current package)
		exemplar.go#L23: 	AttachmentKeySpanContext = "SpanContext"

	go.opencensus.io/plugin/ocgrpc
		stats_common.go#L224: 		attachments[metricdata.AttachmentKeySpanContext] = spanCtx

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