使用该项目更新kubesphere v2.1.0版本告警组件镜像后发送邮件失败

[wenhuwang]

K8S Version: V1.13.4
kubesphere: V2.1.0
更新告警组件deployment: alerting-executor中alerting-adapter容器镜像以后，告警邮件发送失败，发现抱错日志如下所示：
`[root@SHTL009047011 init_zto]# kubectl -n kubesphere-alerting-system logs -f alerting-executor-655995455c-scgtn -c alerting-executor
2020-04-15 11:11:47.55274 -INFO- LoadConf: &{Log:{Level:info} Grpc:{ShowErrorCause:false} Mysql:{Host:mysql.kubesphere-system.svc Port:3306 User:root Password:password Database:alert Disable:false LogMode:false} Etcd:{Endpoints:etcd.kubesphere-system.svc:2379} Queue:{Type:redis Addr:redis://redis.kubesphere-system.svc:6379} App:{Host:localhost Port:9201 ApiHost:localhost ApiPort:9200 NotificationHost:notification.kubesphere-alerting-system.svc:9201 RunMode:executor AdapterPort:8080}} (config.go:108)
2020-04-15 11:11:47.55288 -INFO- mString:{"connStr":"redis://redis.kubesphere-system.svc:6379"} (redis.go:80)
2020-04-15 11:11:47.55308 -INFO- LoadConf: &{Log:{Level:info} Grpc:{ShowErrorCause:false} Mysql:{Host:mysql.kubesphere-system.svc Port:3306 User:root Password:password Database:alert Disable:false LogMode:false} Etcd:{Endpoints:etcd.kubesphere-system.svc:2379} Queue:{Type:redis Addr:redis://redis.kubesphere-system.svc:6379} App:{Host:localhost Port:9201 ApiHost:localhost ApiPort:9200 NotificationHost:notification.kubesphere-alerting-system.svc:9201 RunMode:executor AdapterPort:8080}} (config.go:108)

2020-04-15 11:16:15.80558 -INFO- WatchBroadcast got put event [al-broadcast/al-MONW75w6k1JV] [{"AlertId":"al-MONW75w6k1JV","Operation":"deleting"}] (broadcast_receiver.go:46)
2020-04-15 11:16:25.92474 -INFO- WatchBroadcast got delete event [al-broadcast/al-MONW75w6k1JV] [] (broadcast_receiver.go:50)
2020-04-15 11:18:10.85664 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 11:24:13.86351 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 11:30:16.86954 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 11:35:21.40178 -ERROR- SendNotification CreateNotification failed rpc error: code = InvalidArgument desc = 解码内容失败，内容字段格式应为[{"content_type": "content"}].: invalid character '<' looking for beginning of value (client.go:69)
2020-04-15 11:35:21.4943 -ERROR- sendActiveNotification failed (runner.go:683)
2020-04-15 11:36:19.87545 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 11:42:22.87996 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 11:48:25.88287 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 11:54:28.88627 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 12:00:31.88793 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 12:05:21.40142 -ERROR- SendNotification CreateNotification failed rpc error: code = InvalidArgument desc = 解码内容失败，内容字段格式应为[{"content_type": "content"}].: invalid character '<' looking for beginning of value (client.go:69)
2020-04-15 12:05:21.41226 -ERROR- sendActiveNotification failed (runner.go:683)
2020-04-15 12:06:34.8899 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 12:12:37.89411 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
2020-04-15 12:18:40.89638 -ERROR- AlertReceiver failed to dequeue alert from etcd queue: EOF (alert_receiver.go:66)
`
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