https://developers.weixin.qq.com/doc/service/api/notify/message/api_masssend.html

在调用群发消息by openid发送消息时，从7-6号开始，事件回调所有的发送成功数据SendCount字段总是比FilterCount少5000，并且ErrorCount=0；服务号appID：wx27a249e15088ab1f

回调日志样例：2026-07-07 09:02:28,516 CreateTime=1783386148, MsgType=event, Event=MASSSENDJOBFINISH, EventKey=null, Content=null, MsgId=3147521467, status=send success, totalCount=10000, filterCount=9984, sentCount=4984, errorCount=0, menuId=null, subscribeMsgPopupEvent=null, subscribeMsgChangeEvent=null, subscribeMsgSentEvent=null)],responseStatus[200],response[success]