After upgrading the tidb-cluster to v7.0.0, Grafana cannot log in normally

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Original topic: tidb-cluster升级到v7.0.0后，grafana无法正常登录问题

| username: yulei7633

After upgrading the tidb-cluster to v7.0.0, I found that Grafana could not be logged in while learning to view performance monitoring. The error is as follows: Error while signing in user

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| username: yulei7633 | Original post link

Upon inspection, it was found that the disk space was full. Deleting some data restored normal operation.

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| username: system | Original post link

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