From 12fb38c2add41b241b9a183de26dff33430a07b2 Mon Sep 17 00:00:00 2001
From: lpcy <70789644+lpcy@users.noreply.github.com>
Date: Fri, 23 Apr 2021 20:34:27 +0800
Subject: [PATCH] optimize alarm (#6816)

---
 .../skywalking/oap/server/core/alarm/provider/AlarmCore.java  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/oap-server/server-alarm-plugin/src/main/java/org/apache/skywalking/oap/server/core/alarm/provider/AlarmCore.java b/oap-server/server-alarm-plugin/src/main/java/org/apache/skywalking/oap/server/core/alarm/provider/AlarmCore.java
index 675aa1fb4..09ef00319 100644
--- a/oap-server/server-alarm-plugin/src/main/java/org/apache/skywalking/oap/server/core/alarm/provider/AlarmCore.java
+++ b/oap-server/server-alarm-plugin/src/main/java/org/apache/skywalking/oap/server/core/alarm/provider/AlarmCore.java
@@ -81,7 +81,9 @@ public class AlarmCore {
                         alarmMessageList.addAll(messages);
                     }
                     List<AlarmMessage> filteredMessages = alarmMessageList.stream().filter(msg -> !msg.isOnlyAsCondition()).collect(Collectors.toList());
-                    allCallbacks.forEach(callback -> callback.doAlarm(filteredMessages));
+                    if (filteredMessages.size() > 0) {
+                        allCallbacks.forEach(callback -> callback.doAlarm(filteredMessages));
+                    }
                 }
             } catch (Exception e) {
                 LOGGER.error(e.getMessage(), e);