const go.opentelemetry.io/otel/attribute.emptyID

2 uses

	go.opentelemetry.io/otel/attribute (current package)
		hash.go#L32: 	emptyID        uint64 = 7305809155345288421 // "__empty_" (little endian)
		hash.go#L114: 		h = h.Uint64(emptyID)