[bugfix] Wrong webhook alert template (apache#3265)

Co-authored-by: yinyijun <[email protected]>
Co-authored-by: Logic <[email protected]>

Author: 3 people

hertzbeat-manager/src/main/resources/templates/2-WebhookTemplate.txt

@@ -26,13 +26,13 @@
       </#if>
       "triggerTimes": ${alert.triggerTimes!0},
       "startAt": "${((alert.startAt!0)?number_to_datetime)?string('yyyy-MM-dd HH:mm:ss')}",
-      <#if alert.activeAt?? && alert.activeAt gt 0>,
-      "activeAt": "${((alert.activeAt!0)?number_to_datetime)?string('yyyy-MM-dd HH:mm:ss')}"
+      <#if alert.activeAt?? && alert.activeAt gt 0>
+      "activeAt": "${((alert.activeAt!0)?number_to_datetime)?string('yyyy-MM-dd HH:mm:ss')}",
       </#if>
-      <#if alert.endAt?? && alert.endAt gt 0>,
-      "endAt": "${(alert.endAt?number_to_datetime)?string('yyyy-MM-dd HH:mm:ss')}"
+      <#if alert.endAt?? && alert.endAt gt 0>
+      "endAt": "${(alert.endAt?number_to_datetime)?string('yyyy-MM-dd HH:mm:ss')}"<#if alert.annotations?? && alert.annotations?size gt 0>,</#if>
       </#if>
-      <#if alert.annotations?? && alert.annotations?size gt 0>,
+      <#if alert.annotations?? && alert.annotations?size gt 0>
       "annotations": {
         <#list alert.annotations?keys as key>
         "${key}": "${alert.annotations[key]?json_string}"<#if key?has_next>,</#if>