chore: refine Metric Gauges usage in Go SDK

zhengkezhou1 · web-flow · commit fee9b7f2d629 · 2025-03-19T20:31:21.000+08:00
diff --git a/content/en/docs/languages/go/instrumentation.md b/content/en/docs/languages/go/instrumentation.md
@@ -551,6 +551,8 @@ import (
 
 var fanSpeedSubscription chan int64
 
+var speedGauge metric.Int64Gauge
+
 func init() {
 	speedGauge, err := meter.Int64Gauge(
 		"cpu.fan.speed",
