1.28. metrics-collector 故障排除
当 observability-client-ca-certificate secret 没有在受管集群中被重新刷新时，您可能会收到一个内部服务器错误。
1.28.1. 症状： metrics-collector 无法验证 observability-client-ca-certificate
可能有一个受管集群，其中的指标不可用。如果出现这种情况，您可能会从 metrics-collector 部署中收到以下错误：
error: response status code is 500 Internal Server Error, response body is x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "observability-client-ca-certificate")
