Log redacted: Avoid printing user data (mostly user keys) to info log. Replace the value into ?.
Spec

Logs to be redacted:

• TiFlash process
  • TiKVKeyValue,RowKeyRange,HandleRange [Redact log] Redact key range and value in RSFilter from logging #1282
  • Value in RSFilter [Redact log] Redact key range and value in RSFilter from logging #1282
  • Protobuf struct in logging (not print when the logging.level is INFO)
  • Client-C resolve lock Redact the key value from error log tikv/client-c#59 Log redact for client-c #1306
• ClusterManager
• TiFlashProxy

Related issue in TiDB: pingcap/tidb#18566
Related PR in TiKV: tikv/tikv#8670

• Documents tiflash: Add TiFlash security configuration docs#4412, Add TiFlash security configuration docs-cn#5094