我升级了ambari 2.4.0版
之后，我不能收到任何电子邮件通知时，组件是关键的，确定，警告等。
下面是我发现问题的方法。
我停止了一个regionserver。
之后，我运行命令
curl—用户admin:passwd http://myurl:8080/api/v1/cluster/{clustername}/alert\u notices？字段=*
[结果]
{“href”：myurl，“items”：[]}
[ambari服务器日志] 23 Nov 2016 16:58:00,259 INFO [ambari-client-thread-102] AbstractResourceProvider:925 - Received a updateHostComponent request, clusterName=, serviceName=HDFS, componentName=DATANODE, hostname=, request={ clusterName=, serviceName=HDFS, componentName=DATANODE, hostname=, desiredState=STARTED, state=null, desiredStackId=null, staleConfig=null, adminState=null} 23 Nov 2016 16:58:00,265 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: SQOOP 23 Nov 2016 16:58:00,265 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: HDFS 23 Nov 2016 16:58:00,265 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: MAPREDUCE2 23 Nov 2016 16:58:00,265 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: OOZIE 23 Nov 2016 16:58:00,265 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: TEZ 23 Nov 2016 16:58:00,266 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: SPARK 23 Nov 2016 16:58:00,266 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: HBASE 23 Nov 2016 16:58:00,266 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: ZOOKEEPER 23 Nov 2016 16:58:00,266 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: YARN 23 Nov 2016 16:58:00,266 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: PIG 23 Nov 2016 16:58:00,267 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: HIVE 23 Nov 2016 16:58:00,267 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: SLIDER 23 Nov 2016 16:58:00,267 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: AMBARI_METRICS 23 Nov 2016 16:58:00,267 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2140 - Iterating service type Instance in createHostAction:: NIFI 23 Nov 2016 16:58:00,282 INFO [ambari-client-thread-102] AmbariManagementControllerImpl:2329 - AmbariManagementControllerImpl.createHostAction: created ExecutionCommand for host , role DATANODE, roleCommand START, and command ID 897--1, with cluster-env tags version1479886775473 23 Nov 2016 16:58:00,301 INFO [ambari-action-scheduler] ServiceComponentHostImpl:1067 - Host role transitioned to a new state, serviceComponentName=DATANODE, hostName=, oldState=INSTALLED, currentState=STARTING 23 Nov 2016 16:58:00,441 INFO [ambari-client-thread-102] AbstractProviderModule:953 - Current Metrics collector Host : null 23 Nov 2016 16:58:00,441 INFO [ambari-client-thread-102] AbstractProviderModule:958 - New Metrics collector Host : 23 Nov 2016 16:58:00,951 INFO [qtp-ambari-agent-91] HeartBeatHandler:332 - HeartBeatHandler.sendCommands: sending ExecutionCommand for host , role DATANODE, roleCommand START, and command ID 897-0, task ID 7953 23 Nov 2016 16:58:06,679 INFO [ambari-heartbeat-processor-0] HeartbeatProcessor:505 - Updating applied config on service HDFS, component DATANODE, host 23 Nov 2016 16:58:06,681 INFO [ambari-heartbeat-processor-0] ServiceComponentHostImpl:1067 - Host role transitioned to a new state, serviceComponentName=DATANODE, hostName=, oldState=STARTING, currentState=STARTED 另外，我重新启动了ambari服务器好几次，但我无法解决它。
我怎样才能解决这个问题？