Implement Experiment Metadata Tracking for Realtime Config Updates

FirebaseRemoteConfig/CHANGELOG.md

@@ -1,3 +1,8 @@
+# Unreleased
+- [fixed] Remote Config Realtime updates now trigger when a parameter's experiment
+  or variant assignment changes, ensuring more accurate A/B test analytics and
+  consistent user experiences.
+
 # 12.12.0
 - [added] Introduced a new `configUpdates` property to `RemoteConfig` that
   provides an `AsyncSequence` for consuming real-time config updates.

FirebaseRemoteConfig/Sources/RCNConfigContent.h

@@ -71,6 +71,7 @@ typedef NS_ENUM(NSInteger, RCNDBSource) {
 - (void)activateRolloutMetadata:(void (^)(BOOL success))completionHandler;
 
 /// Returns the updated parameters between fetched and active config.
-- (FIRRemoteConfigUpdate *)getConfigUpdateForNamespace:(NSString *)FIRNamespace;
+- (void)getConfigUpdateForNamespace:(NSString *)FIRNamespace
+                  completionHandler:(void (^)(FIRRemoteConfigUpdate *update))completionHandler;
 
 @end