Fix occasional alarm rule test failure due to race condition

application/src/main/java/org/thingsboard/server/service/cf/ctx/state/alarm/AlarmCalculatedFieldState.java

@@ -150,7 +150,8 @@ public class AlarmCalculatedFieldState extends BaseCalculatedFieldState {
                 clearRuleState = null;
             }
         }
-        log.debug("Initialized create rule states {} and clear rule state {} for {}", createRuleStates, clearRuleState, configuration);
+        log.debug("Initialized create rule states {} and clear rule state {} for {}. Restored: {}, reeval needed: {}",
+                createRuleStates, clearRuleState, configuration, restored, reevalNeeded);
 
         if (reevalNeeded.get()) {
             initCurrentAlarm(ctx);

application/src/main/java/org/thingsboard/server/service/cf/ctx/state/alarm/AlarmRuleState.java

@@ -262,6 +262,14 @@ public class AlarmRuleState {
         }
     }
 
+    public void setDurationCheckFuture(ScheduledFuture<?> durationCheckFuture) {
+        if (this.durationCheckFuture != null) {
+            log.warn("Setting new duration check future while previous is not null for state {}", this, new RuntimeException("stacktrace"));
+            this.durationCheckFuture.cancel(true);
+        }
+        this.durationCheckFuture = durationCheckFuture;
+    }
+
     public boolean isEmpty() {
         return eventCount == 0L && firstEventTs == 0L && lastCheckTs == 0L && durationCheckFuture == null;
     }