Add excerpt about logging signal breaking changes

Author: lzchen

README.md

@@ -14,10 +14,14 @@ See the [OpenTelemetry Instrumentation for Python](https://opentelemetry.io/docs
 | ------- | ------------ | ------- |
 | Traces  | Stable       | N/A     |
 | Metrics | Stable       | N/A     |
-| Logs    | Experimental | N/A     |
+| Logs    | Experimental* | N/A     |
 
 Project versioning information and stability guarantees can be found [here](./rationale.md#versioning-and-releasing).
 
+***Breaking Changes**
+
+We are working on stabilizing the Log signal that would require making deprecations and breaking changes. We will try to reduce the releases that may require an update to your code, especially for instrumentations or for sdk developers.
+
 ## Getting started
 
 You can find the getting started guide for OpenTelemetry Python [here](https://opentelemetry.io/docs/instrumentation/python/getting-started/).