Starting release 22.0.199 (BETA 22.1.56) the new Invantive PSQL package dbms_audit has become available.
Using dbms_audit, module developers of Invantive Cloud applications and stored procedures can call the method register_event. Similar to an insert on AuditEvents@DataDictionary, the register_event procedure register a System Message. For example, the following code register a simple system message with a natural key:
begin
dbms_audit.register_event
( 'xxtst001'
, 'This is a message with natural key.'
, natural_key => 'My NK'
);
end;
System messages are synchronized with Invantive Cloud within seconds and are available in the form “System Messages”:

The available parameters of register_event are listed in Invantive SQL generic PSQL packages.