update more example to use StartMetricsExporter (census-instrumentati…

…on#710)

* update more example to use StartMetricsExporter
- remove StopMetricsExporter from non-main func.

* update options.

content/exporters/supported-exporters/Go/Stackdriver.md

@@ -70,14 +70,17 @@ func main() {
 		ProjectID: "demo-project-id",
 		// MetricPrefix helps uniquely identify your metrics.
 		MetricPrefix: "demo-prefix",
+		// ReportingInterval sets the frequency of reporting metrics
+		// to stackdriver backend.
+		ReportingInterval: 60 * time.Second,
 	})
 	if err != nil {
 		log.Fatalf("Failed to create the Stackdriver exporter: %v", err)
 	}
 	// It is imperative to invoke flush before your main function exits
 	defer sd.Flush()
 
-	// Start metric exporter
+	// Start the metrics exporter
 	sd.StartMetricsExporter()
 	defer sd.StopMetricsExporter()
 }
@@ -98,6 +101,9 @@ func main() {
 		ProjectID: "demo-project-id",
 		// MetricPrefix helps uniquely identify your metrics.
 		MetricPrefix: "demo-prefix",
+		// ReportingInterval sets the frequency of reporting metrics
+		// to stackdriver backend.
+		ReportingInterval: 60 * time.Second,
 	})
 	if err != nil {
 		log.Fatalf("Failed to create the Stackdriver exporter: %v", err)
@@ -127,14 +133,17 @@ func main() {
 		ProjectID: "demo-project-id",
 		// MetricPrefix helps uniquely identify your metrics.
 		MetricPrefix: "demo-prefix",
+		// ReportingInterval sets the frequency of reporting metrics
+		// to stackdriver backend.
+		ReportingInterval: 60 * time.Second,
 	})
 	if err != nil {
 		log.Fatalf("Failed to create the Stackdriver exporter: %v", err)
 	}
 	// It is imperative to invoke flush before your main function exits
 	defer sd.Flush()
 
-	// Start metric exporter
+	// Start the metrics exporter
 	sd.StartMetricsExporter()
 	defer sd.StopMetricsExporter()
 

content/integrations/google_cloud/google_cloud_bigtable/Go/_index.md

@@ -131,8 +131,9 @@ func main() {
 	// Register the exporter as a trace exporter
 	trace.RegisterExporter(sd)
 
-	// Register the exporter as a metrics exporter
-	view.RegisterExporter(sd)
+	// Start the metrics exporter
+	sd.StartMetricsExporter()
+	defer sd.StopMetricsExporter()
 
 	// For demo purposes, always sample
 	trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})

content/integrations/google_cloud/google_cloud_spanner/Go.md

@@ -127,7 +127,7 @@ func main() {
 	// Enable tracing
 	trace.RegisterExporter(se)
 
-	// Start metrics collection
+	// Start the metrics exporter
 	se.StartMetricsExporter()
 	defer se.StopMetricsExporter()
 

content/integrations/memcached/Go.md

@@ -210,10 +210,8 @@ func enableOpenCensusTracingAndMetrics() (func(), error) {
 	// Register as a tracing exporter.
 	trace.RegisterExporter(sd)
 
-	// Register as a metrics exporter.
-	view.RegisterExporter(sd)
-
-	view.SetReportingPeriod(60 * time.Second)
+	// Start metrics exporter.
+	sd.StartMetricsExporter()
 
 	// Most importantly register all the views for GoMemcache.
 	if err := view.Register(memcache.AllViews...); err != nil {

content/integrations/mongodb/go_driver.md

@@ -216,7 +216,8 @@ func main() {
 	if err != nil {
 		log.Fatalf("Failed to create Stackdriver exporter: %v", err)
 	}
-	view.RegisterExporter(sde)
+	sde.StartMetricsExporter()
+	defer sde.StopMetricsExporter()
 	trace.RegisterExporter(sde)
 	if err := mongowrapper.RegisterAllViews(); err != nil {
 		log.Fatalf("Failed to register all views: %v\n", err)

content/integrations/redis/Go/gomodule_redigo.md

@@ -167,7 +167,6 @@ func enableOpenCensus() (func(), error) {
 		return nil, err
 	}
 	sd.StartMetricsExporter()
-	defer sd.StopMetricsExporter()
 
 	return sd.Flush, nil
 }
@@ -249,7 +248,6 @@ func enableOpenCensus() (func(), error) {
 		return nil, err
 	}
 	sd.StartMetricsExporter()
-	defer sd.StopMetricsExporter()
 
 	return sd.Flush, nil
 }
@@ -436,7 +434,6 @@ func enableOpenCensus() (func(), error) {
 		return nil, err
 	}
 	sd.StartMetricsExporter()
-	defer sd.StopMetricsExporter()
 
 	// Enable tracing
 	trace.RegisterExporter(sd)