[runtime] fix runtime example: set provider to global meter provider (#…

…2823)

Signed-off-by: Ziqi Zhao <zhaoziqi9146@gmail.com>

Signed-off-by: Ziqi Zhao <zhaoziqi9146@gmail.com>
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

instrumentation/runtime/example/go.mod

@@ -8,6 +8,7 @@ require (
 	go.opentelemetry.io/contrib/instrumentation/runtime v0.36.1
 	go.opentelemetry.io/otel v1.10.0
 	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.32.1
+	go.opentelemetry.io/otel/metric v0.32.1
 	go.opentelemetry.io/otel/sdk v1.10.0
 	go.opentelemetry.io/otel/sdk/metric v0.32.1
 )
@@ -16,7 +17,6 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-logr/logr v1.2.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	go.opentelemetry.io/otel/metric v0.32.1 // indirect
 	go.opentelemetry.io/otel/trace v1.10.0 // indirect
 	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

instrumentation/runtime/example/main.go

@@ -26,6 +26,7 @@ import (
 
 	"go.opentelemetry.io/contrib/instrumentation/runtime"
 	"go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
+	"go.opentelemetry.io/otel/metric/global"
 	"go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/resource"
 	semconv "go.opentelemetry.io/otel/semconv/v1.11.0"
@@ -51,6 +52,7 @@ func main() {
 			log.Fatal(err)
 		}
 	}()
+	global.SetMeterProvider(provider)
 
 	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer cancel()