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In mysqld.log I have thousands of lines like:

Table mysql/innodb_index_stats has length mismatch in the column name table_name.  Please run mysql_upgrade

So, according to virtually every post on the matter (and error msg itself):

mysql_upgrade -u root -p



Enter password: 

Checking if update is needed.

Checking server version.

Running queries to upgrade MySQL server.

Checking system database.

...

and all tables in all databases are like

...

mysql.columns_priv                                 OK

mysql.db                                           OK

mysql.engine_cost                                  OK

mysql.event                                        OK

mysql.func                                         OK

mysql.general_log                                  OK

mysql.gtid_executed                                OK

mysql.help_category                                OK

mysql.help_keyword                                 OK

mysql.help_relation                                OK

mysql.help_topic                                   OK

mysql.innodb_index_stats                           OK

mysql.innodb_table_stats                           OK

mysql.ndb_binlog_index                             OK

mysql.plugin                                       OK

mysql.proc                                         OK

mysql.procs_priv                                   OK

mysql.proxies_priv                                 OK

mysql.server_cost                                  OK

mysql.servers                                      OK

mysql.slave_master_info                            OK

mysql.slave_relay_log_info                         OK

mysql.slave_worker_info                            OK

mysql.slow_log                                     OK

mysql.tables_priv                                  OK

mysql.time_zone                                    OK

mysql.time_zone_leap_second                        OK

mysql.time_zone_name                               OK

mysql.time_zone_transition                         OK

mysql.time_zone_transition_type                    OK

mysql.user                                         OK

The sys schema is already up to date (version 1.5.1).

Checking databases.

...

But, I am still getting the error in the log

2019-01-27T18:37:15.304587Z 66190 [Warning] InnoDB: Table mysql/innodb_table_stats has length mismatch in the column name table_name.  Please run mysql_upgrade

2019-01-27T18:37:15.304620Z 66190 [Warning] InnoDB: Table mysql/innodb_index_stats has length mismatch in the column name table_name.  Please run mysql_upgrade

2019-01-27T18:37:15.304684Z 66190 [Warning] InnoDB: Table mysql/innodb_table_stats has length mismatch in the column name table_name.  Please run mysql_upgrade

2019-01-27T18:37:15.304707Z 66190 [Warning] InnoDB: Table mysql/innodb_index_stats has length mismatch in the column name table_name.  Please run mysql_upgrade

The structure appears to be okay. Is there a config issue? Please advise.

The answer appears to be - reboot server. I do not have rights to do this, but after admin rebooted, issue appears to be resolved. Not sure why just rebooting MySQL did not fix?

Do you have any clue what is going on when the Warning is being generated? It sounds like some form of version mismatch. Do you have any Plugins?

Please file a bug at bugs.mysql.com .

Meanwhile, do

USE mysql;

SHOW CREATE TABLE innodb_index_stats ;

Check, in particular, the definition of table_name. It used to be

`table_name` varchar(64) COLLATE utf8_bin NOT NULL,

8.0 changes it to

`table_name` varchar(199) COLLATE utf8_bin NOT NULL,

If it is still 64, simulate what mysql_update should have done, by doing

ALTER TABLE innodb_index_stats

    MODIFY   `table_name` varchar(199) COLLATE utf8_bin NOT NULL;

Ditto for innodb_table_stats.