修复 EKS CloudWatch Agent 无法访问 IMDS 问题

问题现象

在 EKS 集群中，部分节点上的 CloudWatch Agent Pods 持续处于 CrashLoopBackOff 状态，查看日志发现以下错误：

E! [EC2] Fetch identity document from EC2 metadata fail: EC2MetadataRequestError: failed to get EC2 instance identity document caused by: EC2MetadataError: failed to make EC2Metadata request status code: 401, request id: I! Detected the instance is OnPremise E! Failed to generate TOML configuration validation content: [Under path : /agent/ruleRegion/ | Error : Region info is missing for mode: onPrem] Configuration validation first phase failed.

关键错误信息:

• 无法访问 EC2 Instance Metadata Service (IMDS)
• 被错误检测为 OnPremise 模式
• 缺少 region 信息导致配置验证失败

环境信息</