Code changes

Author: utpilla

opentelemetry/CHANGELOG.md

@@ -8,6 +8,7 @@
 - Introduced `SyncInstrument` trait to replace the individual synchronous instrument traits (`SyncCounter`, `SyncGauge`, `SyncHistogram`, `SyncUpDownCounter`) which are meant for SDK implementation. [#2207](https://github.com/open-telemetry/opentelemetry-rust/pull/2207)
 - Ensured that `observe` method on asynchronous instruments can only be called inside a callback. This was done by removing the implementation of `AsyncInstrument` trait for each of the asynchronous instruments. [#2210](https://github.com/open-telemetry/opentelemetry-rust/pull/2210)
 - Removed `PartialOrd` and `Ord` implementations for `KeyValue`. [#2215](https://github.com/open-telemetry/opentelemetry-rust/pull/2215)
+- **Breaking change for exporter authors:** Marked `KeyValue` related structs and enums as `non_exhaustive`. [#2228](https://github.com/open-telemetry/opentelemetry-rust/pull/2228)
 
 ## v0.26.0
 Released 2024-Sep-30

opentelemetry/src/common.rs

@@ -376,6 +376,7 @@ impl fmt::Display for Value {
 
 /// A key-value pair describing an attribute.
 #[derive(Clone, Debug, PartialEq)]
+#[non_exhaustive]
 pub struct KeyValue {
     /// The attribute name
     pub key: Key,