Nit fixes to doc and tests

opentelemetry-otlp/src/lib.rs

@@ -177,13 +177,8 @@
 //!        .build()
 //!        .unwrap();
 //!
-//!    let reader = opentelemetry_sdk::metrics::PeriodicReader::builder(exporter)
-//!        .with_interval(std::time::Duration::from_secs(3))
-//!        .with_timeout(Duration::from_secs(10))
-//!        .build();
-//!
 //!    let provider = opentelemetry_sdk::metrics::SdkMeterProvider::builder()
-//!        .with_reader(reader)
+//!         .with_periodic_exporter(exporter)
 //!         .with_resource(Resource::builder_empty().with_attributes([KeyValue::new("service.name", "example")]).build())
 //!         .build();
 //!     # }

opentelemetry-otlp/tests/integration_test/src/metric_helpers.rs

@@ -41,13 +41,12 @@ fn create_exporter() -> MetricExporter {
 /// Initializes the OpenTelemetry metrics pipeline
 fn init_meter_provider() -> SdkMeterProvider {
     let exporter = create_exporter();
-    let reader = PeriodicReader::builder(exporter).build();
     let resource = Resource::builder_empty()
         .with_service_name("metrics-integration-test")
         .build();
     let meter_provider = MeterProviderBuilder::default()
         .with_resource(resource)
-        .with_reader(reader)
+        .with_periodic_exporter(exporter)
         .build();
     opentelemetry::global::set_meter_provider(meter_provider.clone());
     meter_provider

opentelemetry-sdk/src/metrics/meter_provider.rs

@@ -321,6 +321,7 @@ impl fmt::Debug for MeterProviderBuilder {
 }
 #[cfg(all(test, feature = "testing"))]
 mod tests {
+    use crate::error::OTelSdkError;
     use crate::resource::{
         SERVICE_NAME, TELEMETRY_SDK_LANGUAGE, TELEMETRY_SDK_NAME, TELEMETRY_SDK_VERSION,
     };
@@ -487,6 +488,8 @@ mod tests {
 
         // shutdown once more should return an error
         let shutdown_res = provider.shutdown();
+        assert!(matches!(shutdown_res, Err(OTelSdkError::AlreadyShutdown)));
+
         assert!(shutdown_res.is_err());
         assert!(reader.is_shutdown());
         // TODO Fix: the instrument is still available, and can be used.

opentelemetry-sdk/src/metrics/mod.rs

@@ -618,8 +618,9 @@
         }
 
         let exporter = InMemoryMetricExporter::default();
-        let reader = PeriodicReader::builder(exporter.clone()).build();
-        let meter_provider = SdkMeterProvider::builder().with_reader(reader).build();
+        let meter_provider = SdkMeterProvider::builder()
+            .with_periodic_exporter(exporter.clone())
+            .build();
 
         // Test Meter creation in 2 ways, both with empty string as meter name
         let meter1 = meter_provider.meter("");
@@ -634,8 +635,9 @@
     async fn counter_duplicate_instrument_merge() {
         // Arrange
         let exporter = InMemoryMetricExporter::default();
-        let reader = PeriodicReader::builder(exporter.clone()).build();
-        let meter_provider = SdkMeterProvider::builder().with_reader(reader).build();
+        let meter_provider = SdkMeterProvider::builder()
+            .with_periodic_exporter(exporter.clone())
+            .build();
 
         // Act
         let meter = meter_provider.meter("test");
@@ -685,8 +687,9 @@
     async fn counter_duplicate_instrument_different_meter_no_merge() {
         // Arrange
         let exporter = InMemoryMetricExporter::default();
-        let reader = PeriodicReader::builder(exporter.clone()).build();
-        let meter_provider = SdkMeterProvider::builder().with_reader(reader).build();
+        let meter_provider = SdkMeterProvider::builder()
+            .with_periodic_exporter(exporter.clone())
+            .build();
 
         // Act
         let meter1 = meter_provider.meter("test.meter1");
@@ -774,8 +777,9 @@
     async fn instrumentation_scope_identity_test() {
         // Arrange
         let exporter = InMemoryMetricExporter::default();
-        let reader = PeriodicReader::builder(exporter.clone()).build();
-        let meter_provider = SdkMeterProvider::builder().with_reader(reader).build();
+        let meter_provider = SdkMeterProvider::builder()
+            .with_periodic_exporter(exporter.clone())
+            .build();
 
         // Act
         // Meters are identical except for scope attributes, but scope attributes are not an identifying property.
@@ -858,7 +862,6 @@
 
         // Arrange
         let exporter = InMemoryMetricExporter::default();
-        let reader = PeriodicReader::builder(exporter.clone()).build();
         let criteria = Instrument::new().name("test_histogram");
         let stream_invalid_aggregation = Stream::new()
             .aggregation(aggregation::Aggregation::ExplicitBucketHistogram {
@@ -871,7 +874,7 @@
         let view =
             new_view(criteria, stream_invalid_aggregation).expect("Expected to create a new view");
         let meter_provider = SdkMeterProvider::builder()
-            .with_reader(reader)
+            .with_periodic_exporter(exporter.clone())
             .with_view(view)
             .build();
 
@@ -908,15 +911,14 @@
 
         // Arrange
         let exporter = InMemoryMetricExporter::default();
-        let reader = PeriodicReader::builder(exporter.clone()).build();
         let criteria = Instrument::new().name("my_observable_counter");
         // View drops all attributes.
         let stream_invalid_aggregation = Stream::new().allowed_attribute_keys(vec![]);
 
         let view =
             new_view(criteria, stream_invalid_aggregation).expect("Expected to create a new view");
         let meter_provider = SdkMeterProvider::builder()
-            .with_reader(reader)
+            .with_periodic_exporter(exporter.clone())
             .with_view(view)
             .build();
 
@@ -983,15 +985,14 @@
 
         // Arrange
         let exporter = InMemoryMetricExporter::default();
-        let reader = PeriodicReader::builder(exporter.clone()).build();
         let criteria = Instrument::new().name("my_counter");
         // View drops all attributes.
         let stream_invalid_aggregation = Stream::new().allowed_attribute_keys(vec![]);
 
         let view =
             new_view(criteria, stream_invalid_aggregation).expect("Expected to create a new view");
         let meter_provider = SdkMeterProvider::builder()
-            .with_reader(reader)
+            .with_periodic_exporter(exporter.clone())
             .with_view(view)
             .build();
 
@@ -2543,10 +2544,10 @@
     impl TestContext {
         fn new(temporality: Temporality) -> Self {
             let exporter = InMemoryMetricExporterBuilder::new().with_temporality(temporality);
-
             let exporter = exporter.build();
-            let reader = PeriodicReader::builder(exporter.clone()).build();
-            let meter_provider = SdkMeterProvider::builder().with_reader(reader).build();
+            let meter_provider = SdkMeterProvider::builder()
+                .with_periodic_exporter(exporter.clone())
+                .build();
 
             TestContext {
                 exporter,

opentelemetry-stdout/examples/basic.rs

@@ -7,7 +7,7 @@ use opentelemetry::{global, KeyValue};
 use opentelemetry::trace::Tracer;
 
 #[cfg(feature = "metrics")]
-use opentelemetry_sdk::metrics::{PeriodicReader, SdkMeterProvider};
+use opentelemetry_sdk::metrics::SdkMeterProvider;
 
 #[cfg(feature = "trace")]
 use opentelemetry_sdk::trace::SdkTracerProvider;
@@ -33,9 +33,8 @@ fn init_trace() -> SdkTracerProvider {
 #[cfg(feature = "metrics")]
 fn init_metrics() -> opentelemetry_sdk::metrics::SdkMeterProvider {
     let exporter = opentelemetry_stdout::MetricExporter::default();
-    let reader = PeriodicReader::builder(exporter).build();
     let provider = SdkMeterProvider::builder()
-        .with_reader(reader)
+        .with_periodic_exporter(exporter)
         .with_resource(RESOURCE.clone())
         .build();
     global::set_meter_provider(provider.clone());

opentelemetry-stdout/src/lib.rs

@@ -34,8 +34,7 @@
 //!
 //! fn init_metrics() -> SdkMeterProvider {
 //!     let exporter = opentelemetry_stdout::MetricExporter::default();
-//!     let reader = PeriodicReader::builder(exporter).build();
-//!     SdkMeterProvider::builder().with_reader(reader).build()
+//!     SdkMeterProvider::builder().with_periodic_exporter(exporter).build()
 //! }
 //!
 //! fn init_logs() -> LoggerProvider {