The terms master and slave have historically been used in replication, but the
terms terms primary and replica are now preferred. The old terms are used
still used in parts of the documentation, and in MariaDB commands, although
MariaDB 10.5 has begun the process of renaming. The documentation process is
ongoing. See MDEV-18777 to follow progress on this effort.

Syntax
------

SHOW RELAYLOG ['connection_name'] EVENTS
  [IN 'log_name'] [FROM pos] [LIMIT [offset,] row_count]
  [ FOR CHANNEL 'channel_name']

Description
-----------

On replicas, this command shows the events in the relay log. If 'log_name' is
not specified, the first relay log is shown.

Syntax for the LIMIT clause is the same as for SELECT ... LIMIT.

Using the LIMIT clause is highly recommended because the SHOW RELAYLOG EVENTS
command returns the complete contents of the relay log, which can be quite
large.

This command does not return events related to setting user and system
variables. If you need those, use mariadb-binlog.

On the primary, this command does nothing.

Requires the REPLICA MONITOR privilege (>= MariaDB 10.5.9), the REPLICATION
SLAVE ADMIN privilege (>= MariaDB 10.5.2) or the REPLICATION SLAVE privilege
(<= MariaDB 10.5.1).

connection_name
---------------

If there is only one nameless primary, or the default primary (as specified by
the default_master_connection system variable) is intended, connection_name
can be omitted. If provided, the SHOW RELAYLOG statement will apply to the
specified primary. connection_name is case-insensitive.

MariaDB starting with 10.7.0
----------------------------
The FOR CHANNEL keyword was added for MySQL compatibility. This is identical
as using the channel_name directly after SHOW RELAYLOG.

URL: https://mariadb.com/kb/en/show-relaylog-events/