GKE应用默认凭证问题：请求两类日志信息及相关背景说明

1. 默认凭证不正确的日志消息 #

• 核心错误日志：

  Error: Could not load the default credentials.

• 关联权限触发日志（因无Cloud Storage访问权限引发）：

  Permission denied: Missing required permissions for Cloud Storage operations.
Failed to access Cloud Storage resource: No valid credentials provided.

2. 默认凭证已设置的日志消息 #

• 凭证加载成功日志：

  Successfully loaded default credentials from GKE cluster metadata service.
Default credentials initialized via workload identity for GKE workload.

• 权限验证通过日志：

  Authenticated with default credentials, authorized to access Cloud Storage resources.

补充说明：该错误发生在发布新增Pub/Sub主题的应用、同时用Terraform注册主题调度器期间，重新部署同一模块后问题解决。

内容的提问来源于stack exchange，提问作者酒井祐樹