Update CHANGELOGs for time changes in metrics aggregations (#2412)

Co-authored-by: Cijo Thomas <[email protected]>
Co-authored-by: Cijo Thomas <[email protected]>

Author: fraillt

opentelemetry-sdk/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## vNext
 
+- *Breaking(Affects custom metric exporter authors only)* `start_time` and `time` is moved from DataPoints to aggregations (Sum, Gauge, Histogram, ExpoHistogram) see [#2377](https://github.com/open-telemetry/opentelemetry-rust/pull/2377) and [#2411](https://github.com/open-telemetry/opentelemetry-rust/pull/2411), to reduce memory.
+
+- *Breaking* `start_time` is no longer optional for `Sum` aggregation, see [#2367](https://github.com/open-telemetry/opentelemetry-rust/pull/2367), but is still optional for `Gauge` aggregation see [#2389](https://github.com/open-telemetry/opentelemetry-rust/pull/2389).
+
 - *Breaking*
   - SimpleLogProcessor modified to be generic over `LogExporter` to
     avoid dynamic dispatch to invoke exporter. If you were using

opentelemetry-stdout/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## vNext
 
+- *Breaking* time fields, `StartTime` and `EndTime` is printed on aggregation (Sum, Gauge, Histogram, ExpoHistogram) with 2 tabs, previously it was on aggregation data point, with 3 tabs, see [#2377](https://github.com/open-telemetry/opentelemetry-rust/pull/2377) and [#2411](https://github.com/open-telemetry/opentelemetry-rust/pull/2411).
+
 ## 0.27.0
 
 Released 2024-Nov-11