Performance Schema MyRocks changes

RocksDB WAL file information can be seen in the performance_schema.log_status table in the STORAGE ENGINE column.

This feature has been implemented in Percona Server 8.0.15-6 release.

Example

mysql> select * from performance_schema.log_status\G

*************************** 1. row ***************************

SERVER_UUID: f593b4f8-6fde-11e9-ad90-080027c2be11
    LOCAL: {"gtid_executed": "", "binary_log_file": "binlog.000004", "binary_log_position": 1698222}
REPLICATION: {"channels": []}
STORAGE_ENGINES: {"InnoDB": {"LSN": 36810235, "LSN_checkpoint": 36810235}, "RocksDB": {"wal_files": [{"path_name": "/000026.log", "log_number": 26, "size_file_bytes": 371869}]}}
1 row in set (0.00 sec)

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