Fix CHANGELOG.md and preserve all content

Signed-off-by: Yogi Suthari <[email protected]>

Author: yrsuthari

CHANGELOG.md

@@ -7,9 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Fix broken documentation link in Prometheus exporter README and add missing Prometheus exporter documentation (#4399)
 - Fix user agent in OTLP HTTP metrics exporter
   ([#4475](https://github.com/open-telemetry/opentelemetry-python/pull/4475))
-- Fix broken documentation link in Prometheus exporter README and add missing Prometheus exporter documentation (#4399)
 - Improve performance of baggage operations
   ([#4466](https://github.com/open-telemetry/opentelemetry-python/pull/4466))
 
@@ -627,8 +627,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#2577](https://github.com/open-telemetry/opentelemetry-python/pull/2577))
 - Add default aggregation
   ([#2543](https://github.com/open-telemetry/opentelemetry-python/pull/2543))
-- Fix incorrect installation of some exporter "convenience" packages into
-  "site-packages/src"
+- Fix incorrect installation of some exporter “convenience” packages into
+  “site-packages/src”
   ([#2525](https://github.com/open-telemetry/opentelemetry-python/pull/2525))
 - Capture exception information as part of log attributes
   ([#2531](https://github.com/open-telemetry/opentelemetry-python/pull/2531))
@@ -1713,3 +1713,60 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Initial release api/sdk
+
+- Use Attribute rather than boundattribute in logrecord
+  ([#3567](https://github.com/open-telemetry/opentelemetry-python/pull/3567))
+- Fix flush error when no LoggerProvider configured for LoggingHandler
+  ([#3608](https://github.com/open-telemetry/opentelemetry-python/pull/3608))
+- Fix `OTLPMetricExporter` ignores `preferred_aggregation` property
+  ([#3603](https://github.com/open-telemetry/opentelemetry-python/pull/3603))
+- Logs: set `observed_timestamp` field
+  ([#3565](https://github.com/open-telemetry/opentelemetry-python/pull/3565))
+- Add missing Resource SchemaURL in OTLP exporters
+  ([#3652](https://github.com/open-telemetry/opentelemetry-python/pull/3652))
+- Fix loglevel warning text
+  ([#3566](https://github.com/open-telemetry/opentelemetry-python/pull/3566))
+- Prometheus Exporter string representation for target_info labels
+  ([#3659](https://github.com/open-telemetry/opentelemetry-python/pull/3659))
+- Logs: ObservedTimestamp field is missing in console exporter output
+  ([#3564](https://github.com/open-telemetry/opentelemetry-python/pull/3564))
+- Fix explicit bucket histogram aggregation
+  ([#3429](https://github.com/open-telemetry/opentelemetry-python/pull/3429))
+- Add `code.lineno`, `code.function` and `code.filepath` to all logs
+  ([#3645](https://github.com/open-telemetry/opentelemetry-python/pull/3645))
+- Add Synchronous Gauge instrument
+  ([#3462](https://github.com/open-telemetry/opentelemetry-python/pull/3462))
+- Drop support for 3.7
+  ([#3668](https://github.com/open-telemetry/opentelemetry-python/pull/3668))
+- Include key in attribute sequence warning
+  ([#3639](https://github.com/open-telemetry/opentelemetry-python/pull/3639))
+- Upgrade markupsafe, Flask and related dependencies to dev and test
+  environments ([#3609](https://github.com/open-telemetry/opentelemetry-python/pull/3609))
+- Handle HTTP 2XX responses as successful in OTLP exporters
+  ([#3623](https://github.com/open-telemetry/opentelemetry-python/pull/3623))
+- Improve Resource Detector timeout messaging
+  ([#3645](https://github.com/open-telemetry/opentelemetry-python/pull/3645))
+- Add Proxy classes for logging
+  ([#3575](https://github.com/open-telemetry/opentelemetry-python/pull/3575))
+- Remove dependency on 'backoff' library
+  ([#3679](https://github.com/open-telemetry/opentelemetry-python/pull/3679))
+
+
+- Make create_gauge non-abstract method
+  ([#3817](https://github.com/open-telemetry/opentelemetry-python/pull/3817))
+- Make `tracer.start_as_current_span()` decorator work with async functions
+  ([#3633](https://github.com/open-telemetry/opentelemetry-python/pull/3633))
+- Fix python 3.12 deprecation warning
+  ([#3751](https://github.com/open-telemetry/opentelemetry-python/pull/3751))
+- bump mypy to 0.982
+  ([#3776](https://github.com/open-telemetry/opentelemetry-python/pull/3776))
+- Add support for OTEL_SDK_DISABLED environment variable
+  ([#3648](https://github.com/open-telemetry/opentelemetry-python/pull/3648))
+- Fix ValueError message for PeriodicExportingMetricsReader
+  ([#3769](https://github.com/open-telemetry/opentelemetry-python/pull/3769))
+- Use `BaseException` instead of `Exception` in `record_exception`
+  ([#3354](https://github.com/open-telemetry/opentelemetry-python/pull/3354))
+- Make span.record_exception more robust
+  ([#3778](https://github.com/open-telemetry/opentelemetry-python/pull/3778))
+- Fix license field in pyproject.toml files
+  ([#3803](https://github.com/open-telemetry/opentelemetry-python/pull/3803))