use ff in otlp example

Author: cijothomas

opentelemetry-otlp/examples/basic-otlp/Cargo.toml

@@ -5,6 +5,9 @@ edition = "2021"
 license = "Apache-2.0"
 publish = false
 
+[features]
+experimental_metrics_periodicreader_with_async_runtime = ["opentelemetry_sdk/experimental_metrics_periodicreader_with_async_runtime"]
+
 [dependencies]
 once_cell = { workspace = true }
 opentelemetry = { path = "../../../opentelemetry", features = ["metrics", "logs"] }

opentelemetry-otlp/examples/basic-otlp/src/main.rs

@@ -35,6 +35,9 @@ fn init_traces() -> Result<sdktrace::TracerProvider, TraceError> {
 fn init_metrics() -> Result<opentelemetry_sdk::metrics::SdkMeterProvider, MetricError> {
     let exporter = MetricExporter::builder().with_tonic().build()?;
 
+    #[cfg(feature = "experimental_metrics_periodicreader_with_async_runtime")]
+    let reader = PeriodicReader::builder(exporter, runtime::Tokio).build();
+    #[cfg(not(feature = "experimental_metrics_periodicreader_with_async_runtime"))]
     let reader = PeriodicReader::builder(exporter).build();
 
     Ok(SdkMeterProvider::builder()