chore: add changelog and todo

Signed-off-by: Shivanshu Raj Shrivastava <[email protected]>

Author: shivanshuraj1333

opentelemetry-otlp/CHANGELOG.md

@@ -17,6 +17,10 @@
  `Error` which contained many variants unrelated to building an exporter, the
  new one returns specific variants applicable to building an exporter. Some
  variants might be applicable only on select features.
+- *Breaking*
+  [#2779](https://github.com/open-telemetry/opentelemetry-rust/issues/2779) handle
+  shutdown for span exporter for `http` exporters, shutdown for `grpc` would be added
+  separately.
 
 ## 0.28.0
 

opentelemetry-otlp/src/exporter/tonic/trace.rs

@@ -90,6 +90,11 @@ impl SpanExporter for TonicTracesClient {
     }
 
     fn shutdown(&self) -> OTelSdkResult {
+        // ToDo: as part of https://github.com/open-telemetry/opentelemetry-rust/pull/2812
+        // self is no longer mutable due to trait change for span exporter
+        // the shutdown for gRPC needs to implemented and tracked in
+        // https://github.com/open-telemetry/opentelemetry-rust/issues/2777
+        //
         // match self.inner.take() {
         //     Some(_) => Ok(()), // Successfully took `inner`, indicating a successful shutdown.
         //     None => Err(OTelSdkError::AlreadyShutdown), // `inner` was already `None`, meaning it's already shut down.