var go.opencensus.io/plugin/ochttp.Host

3 uses

	go.opencensus.io/plugin/ochttp (current package)
		client_stats.go#L38: 		tag.Upsert(Host, req.Host),
		server.go#L151: 		tag.Upsert(Host, r.Host),
		stats.go#L95: 	Host = tag.MustNewKey("http.host")

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