Update instrumentation/all/CHANGELOG.md

Author: kaylareopelle

instrumentation/all/CHANGELOG.md

@@ -3,6 +3,12 @@
 ### v0.79.0 / 2025-08-18
 
 * ADDED: Add HTTPX instrumentation to all
+* ADDED: Add Ethon `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable [#1561](https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/1561)
+* ADDED: Add Excon `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable [#1569](https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/1569)
+* ADDED: Add Faraday `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable [#1592](https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/1592)
+* ADDED: Add HTTPClient `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable [#1588](https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/1588)
+* ADDED: HTTPX `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable [#1589](https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/1589)
+* ADDED: Add REST Client `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable [#1568](https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/1568)
 
 ### v0.78.0 / 2025-06-17