Crypto: Add telemetry for events unable to decrypt (UTDs)

Add a dispatch method

Riot/Analytics/DecryptionFailureTracker.h

@@ -46,6 +46,11 @@
  */
 - (void)reportUnableToDecryptErrorForEvent:(MXEvent*)event withRoomState:(MXRoomState*)roomState myUser:(NSString*)userId;
 
+/**
+ Flush current data.
+ */
+- (void)dispatch;
+
 @end
 
 /**

Riot/Analytics/DecryptionFailureTracker.m

@@ -99,6 +99,11 @@
     reportedFailures[event.eventId] = decryptionFailure;
 }
 
+- (void)dispatch
+{
+    [self checkFailures];
+}
+
 #pragma mark - Private methods
 
 /**

Riot/AppDelegate.m

@@ -559,6 +559,7 @@ NSString *const kAppDelegateNetworkStatusDidChangeNotification = @"kAppDelegateN
     _isAppForeground = NO;
     
     // Analytics: Force to send the pending actions
+    [[DecryptionFailureTracker sharedInstance] dispatch];
     [[Analytics sharedInstance] dispatch];
 }