AWS CloudWatch Agent在EC2上异常：误判为On-Premise环境

环境与配置详情 #

运行Amazon Linux 2的EC2实例上安装了AWS CloudWatch Agent，配置文件内容如下：

{
  "agent": {
    "metrics_collection_interval": 60,
    "run_as_user": "cwagent"
  },
  "metrics": {
    "append_dimensions": {
        "InstanceId": "${aws:InstanceId}"
    },
    "metrics_collected": {
      "disk": {
        "measurement": [
          "used_percent"
        ],
        "metrics_collection_interval": 60,
        "resources": [
          "/"
        ]
      }
    }
  }
}

执行命令tail -f /opt/aws/amazon-cloudwatch-agent/logs/amazon-cloudwatch-agent.log验证配置时，出现以下错误：

I! Detected the instance is OnPremise
2023/06/21 11:52:36 Reading json config file path: /opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json ...
2023/06/21 11:52:36 I! Valid Json input schema.
I! Detecting run_as_user...
2023/06/21 11:52:36 E! Credentials path is not set while runasuser is not root
2023/06/21 11:52:36 E! Credentials path is not set while runasuser is not root
2023/06/21 11:52:36 Configuration validation first phase failed. Agent version: 1.0. Verify the JSON input is only using features supported by this version.

2023/06/21 11:52:36 I! Return exit error: exit code=1
2023/06/21 11:52:36 E! Cannot translate JSON config into TOML, ERROR is exit status 1

已按官方文档安装配置Agent，确认网络连通正常，尝试过重新安装，问题未解决。

补充测试结果 #

已确认运行最新版本CloudWatch Agent，检查过防火墙，日志显示：

2023/07/05 07:59:41 I! D! [EC2] Found active network interface
E! ec2metadata is not available
I! Detected the instance is OnPremise
2023/07/05 07:59:41 Reading json config file path: /opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json ...
2023/07/05 07:59:41 E! Failed to generate merged json config: unable to get old json config file with error: unable to parse json, error: invalid character '}' after top-level value
2023/07/05 07:59:41 E! Failed to generate merged json config: unable to get old json config file with error: unable to parse json, error: invalid character '}' after top-level value
2023/07/05 07:59:41 Configuration validation first phase failed. Agent version: 1.0. Verify the JSON input is only using features supported by this version.

2023/07/05 07:59:41 I! Return exit error: exit code=1
2023/07/05 07:59:41 E! Cannot translate JSON config into TOML, ERROR is exit status 1

使用命令wget -q -O - http://169.254.169.254/latest/meta-data/instance-id && echo 测试元数据服务连接，成功获取到实例ID，但问题仍存在。

内容的提问来源于stack exchange，提问作者Roei Sagi