MINIO_ETCD_CLIENT_CERT_KEY  (path)      client cert key for mTLS authentication
MINIO_ETCD_COMMENT          (sentence)  optionally add a comment to this setting
```

This behavior is consistent across all keys; each key self-documents itself with valid examples.

## Dynamic systems without restarting server

        // This is verified by checking the behavior matches expected constant usage

        // Since the constant is private, we can't access it directly
        // But we can verify the behavior is consistent
        try {
            WebApiUtil.setError(400, "Test error");
            WebApiUtil.validate(); // Should not throw in test environment
        } catch (Exception e) {

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