Removed Empty message in L3 Centralized Attack Detector to prevent collision with Context.Empty

proto/l3_centralizedattackdetector.proto

@@ -18,10 +18,10 @@ import "context.proto";
 
 service L3Centralizedattackdetector {
   // Analyze single input to the ML model in the CAD component
-  rpc AnalyzeConnectionStatistics (L3CentralizedattackdetectorMetrics) returns (context.Empty) {}
+  rpc AnalyzeConnectionStatistics (L3CentralizedattackdetectorMetrics) returns (StatusMessage) {}
 
   // Analyze a batch of inputs to the ML model in the CAD component
-  rpc AnalyzeBatchConnectionStatistics (L3CentralizedattackdetectorBatchInput) returns (context.Empty) {}
+  rpc AnalyzeBatchConnectionStatistics (L3CentralizedattackdetectorBatchInput) returns (StatusMessage) {}
 
   // Get the list of features used by the ML model in the CAD component
   rpc GetFeaturesIds (context.Empty) returns (AutoFeatures) {}
@@ -63,6 +63,6 @@ message L3CentralizedattackdetectorBatchInput {
 	repeated L3CentralizedattackdetectorMetrics metrics = 1;
 }
 
-// message Empty {
-// 	string message = 1;
-// }
+message StatusMessage {
+	string message = 1;
+}