feat(backpressure): Clarify languages in perf overhead and add ruby option (#9458)

Author: sl0thentr0py

docs/platforms/ruby/common/configuration/options.mdx

@@ -247,6 +247,12 @@ You can gain more control on tracing event (transaction)'s sampling decision by
 
 <PlatformContent includePath="performance/traces-sampler-as-sampler" />
 
+`enable_backpressure_handling`
+
+A boolean that controls whether a new monitor thread will be spawned to perform health checks on the SDK. If the system is unhealthy, the SDK will keep halving the `traces_sample_rate` set by you in 10 second intervals until recovery. This downsampling helps ensure that the system stays stable and reduces SDK overhead under high load.
+
+This option is disabled by default.
+
 ## Transport Options
 
 `transport_class`

docs/product/performance/performance-overhead.mdx

@@ -31,7 +31,15 @@ Each SDK has limits on the data structures used to record all the above data. If
 
 ### Backpressure Management
 
-The Python SDK, starting with version `1.30.0`, manages backpressure internally by reducing the dynamic sampling rate when the system is in an unhealthy state. This ensures better system stability and lower SDK overhead under heavy load. We will gradually roll this out to other backend languages in the future.
+Some of our backend SDKs manage backpressure internally by reducing the dynamic sampling rate when the system is in an unhealthy state. This ensures better system stability and lower SDK overhead under heavy load.
+
+The latest versions of the following SDKs support backpressure management:
+
+- Python
+- Ruby
+- Java
+
+We will gradually roll this feature out to other backend languages in the future.
 
 ### Hosting Environment