chore: update changelog for version 2.15.1 (#11254)

- [x] update changelog for version 2.15.1

---------

Signed-off-by: Juanjo Alvarez <[email protected]>

CHANGELOG.md

@@ -2,6 +2,33 @@
 
 Changelogs for versions not listed here can be found at https://github.com/DataDog/dd-trace-py/releases
 
+---
+
+## 2.15.1
+
+
+### Bug Fixes
+
+- CI Visibility: 
+  - Fixes a bug where `CODEOWNERS` would incorrectly fail to discard line-level trailing comments (eg: `@code/owner # my comment` would result in codeowners being parsed as `@code/owner`, `#`, `my`, and `comment`)
+  - Fixes unnecessary logging of an exception that would appear when trying to upload git metadata in an environment without functioning git (eg: missing `git` binary or `.git` directory)
+- Code Security: 
+  - Resolves an issue where importing the `google.cloud.storage.batch` module would fail raising an ImportError.
+- Dynamic Instrumentation: 
+  - Fixes an issue that prevented dynamic span tags probes from adding the requested tags to the requested span.
+- LLM Observability:
+  - This fix resolves two issues with annotation contexts:  
+    - annotations registered via annotation contexts were being applied globally. Annotations are now only applied to the current trace context and do not pollute to other threads & processes.
+    - annotations from nested annotation contexts were applied in a non-deterministic order. Annotations are now applied in the order they were registered.
+- Profiling: 
+  - fix a data race where span information associated with a thread was read and updated concurrently, leading to segfaults
+  - resolves an issue where endpoint profiling for stack v2 throws `TypeError` exception when it is given a `Span` with `None` span\_type.
+
+### Other Changes
+- LLM Observability: 
+  - Updates the merging behavior for tags when <span class="title-ref">LLMObs.annotate</span> is called multiple times on the same span so that the latest value for a tag key overrides the previous value.
+
+
 ---
 
 ## 2.15.0