expire_logs_days does not exists in MariaDB 10.11 Parameter group

I believe, certain parameters were deprecated from 10.11 in MariaDB. As rightly mentioned by you, in order to retain the binary logs, it is required to call a stored procedure that will allow you to set up retention period in hours.

Below is the command :

call mysql.rds_set_configuration('binlog retention hours', 48);

This will help you retain the binlogs for 48 hours.

To see the value set you can run the following command:

CALL mysql.rds_show_configuration;

Some references:

mysql.rds_set_configuration - https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/mysql_rds_set_configuration.html Accessing MySQL binary logs - https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_LogAccess.MySQL.Binarylog.html