MySQL  8.0.21
Source Code Documentation
COM_STATISTICS

Get a human readable string of some internal status vars.

The statistics are refreshed at the time of executing this command. If the returned string is of zero length an error message is returned by mysql_stat to the client application instead of the actual empty statistics string.

Returns
elther a string<EOF>
Payload
TypeNameDescription
int<1> command 0x08: COM_STATISTICS
See also
cli_read_statistics, mysql_stat, dispatch_command, calc_sum_of_all_status