我能够启动一个实例并让它由Systems Manager 管理。也就是说，直到它自动更新 SSM 代理。更新成功，从 更新3.0.161.0到3.0.854.0。操作系统是 Ubuntu 20.04。
尽管它没有出现在托管实例列表中，但我仍然可以使用会话管理器连接到实例。
不确定这是否相关，但这里是/var/log/amazon/ssm/errors.log：
2021-03-21 03:56:50 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [MessagingDeliveryService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
2021-03-21 03:56:50 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [OfflineService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
2021-03-21 03:56:51 ERROR [Process @ backend.go.139] [ssm-document-worker] [28785d7e-bfaf-414b-bd02-fc3a1746610b] [DataBackend] failed to unmarshal plugin config: json: cannot unmarshal object into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type string
2021-03-21 03:56:51 ERROR [Messaging @ messaging.go.145] [ssm-document-worker] [28785d7e-bfaf-414b-bd02-fc3a1746610b] messaging pipeline process datagram encountered error: json: cannot unmarshal object into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditionsof type string
2021-03-21 03:56:50 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [MessageGatewayService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
2021-03-21 03:56:50 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [MessagingDeliveryService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
2021-03-21 03:56:50 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [OfflineService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
2021-03-21 03:56:50 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [MessageGatewayService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
2021-03-21 03:56:51 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [MessagingDeliveryService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
2021-03-21 03:56:51 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [OfflineService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
2021-03-21 03:56:51 ERROR [GetDocumentState @ docmanager.go.147] [ssm-agent-worker] [MessageGatewayService] encountered error with message json: cannot unmarshal string into Go struct field Configuration.InstancePluginsInformation.Configuration.Preconditions of type contracts.PreconditionArgument while reading Interim state of command from file - 28785d7e-bfaf-414b-bd02-fc3a1746610b
知道这个问题的原因是什么吗？