[#MDEV-21760] second_behind_master not good at all

I monitor SHOW SLAVE STATUS each 5 seconds, and some time without any reason second behind master give me a crazy number :

MariaDB [pmacontrol]> select * from ts_value_slave_int where id_ts_variable = 815 and date= '2020-02-18 06:25:24' and id_mysql_server=33;

+---------+-----------------+----------------+-----------------+---------------------+--------+

| id      | id_mysql_server | id_ts_variable | connection_name | date                | value  |

+---------+-----------------+----------------+-----------------+---------------------+--------+

| 3823039 |              33 |            815 |                 | 2020-02-18 06:25:24 | 411094 |

+---------+-----------------+----------------+-----------------+---------------------+--------+

it seem an even generate this problem, it's all time happen on the same Master/Slave (when it's happen)

[MDEV-21760] second_behind_master not good at all Created: 2020-02-18 Updated: 2020-02-18
Status:	Open
Project:	MariaDB Server
Component/s:	None
Affects Version/s:	None
Fix Version/s:	None