enhance the alarm kernel with recovered status notification capability #13492

Author: youjie23

oap-server/server-alarm-plugin/src/main/java/org/apache/skywalking/oap/server/core/alarm/provider/RunningRule.java

@@ -268,7 +268,7 @@ public Window(AlarmEntity entity, int period, int silencePeriod, int recoveryObs
                       int additionalPeriod) {
             this.entity = entity;
             this.additionalPeriod = additionalPeriod;
-            this.size = period + additionalPeriod /*+ Math.max(silencePeriod, recoveryObservationPeriod)*/;
+            this.size = period + additionalPeriod;
             this.period = period;
             this.stateMachine = new AlarmStateMachine(silencePeriod, recoveryObservationPeriod);
             this.init();