fix: Make NoopMeterProvider public to allow external usage

opentelemetry/src/metrics/mod.rs

@@ -4,7 +4,7 @@ use std::sync::Arc;
 
 mod instruments;
 mod meter;
-pub(crate) mod noop;
+pub mod noop;
 pub use instruments::{
     counter::{Counter, ObservableCounter},
     gauge::{Gauge, ObservableGauge},
@@ -14,6 +14,7 @@ pub use instruments::{
     SyncInstrument,
 };
 pub use meter::{Meter, MeterProvider};
+pub use noop::NoopMeterProvider;
 
 /// SDK implemented trait for creating instruments
 pub trait InstrumentProvider {

opentelemetry/src/metrics/noop.rs

@@ -13,13 +13,13 @@ use super::instruments::SyncInstrument;
 
 /// A no-op instance of a `MetricProvider`
 #[derive(Debug, Default)]
-pub(crate) struct NoopMeterProvider {
+pub struct NoopMeterProvider {
     _private: (),
 }
 
 impl NoopMeterProvider {
     /// Create a new no-op meter provider.
-    pub(crate) fn new() -> Self {
+    pub fn new() -> Self {
         NoopMeterProvider { _private: () }
     }
 }