Fix gauge constant

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

cmd/containerd-stress/main.go

@@ -34,7 +34,7 @@ func init() {
 	// if you want more fine grained metrics then you can drill down with the metrics in prom that
 	// containerd is outputing
 	ct = ns.NewLabeledTimer("run", "Run time of a full container during the test", "commit")
-	binarySizeGauge = ns.NewLabeledGauge("binary_size", "Binary size of compiled binaries", "name")
+	binarySizeGauge = ns.NewLabeledGauge("binary_size", "Binary size of compiled binaries", metrics.Bytes, "name")
 	errCounter = ns.NewLabeledCounter("errors", "Errors encountered running the stress tests", "err")
 	metrics.Register(ns)
 }