What does the last digit of aws RDS server_audit.log mean?

Amazon RDS (Relational Database Service) is a managed relational database service provided by Amazon that supports multiple database engines, including MySQL, PostgreSQL, MariaDB, Oracle, and Microsoft SQL Server. Each database engine has its own set of error codes and status codes. The following are some common Amazon RDS error codes, which may include errors related to logging operations:

MySQL:

1213: Deadlock found when trying to get lock

1227：Access denied; you need (at least one of) the SUPER privilege(s) for this operation

1235: This version of MySQL doesn't yet support 'multiple triggers with the same action time and event for one table'

2003: Can't connect to MySQL server on 'hostname' (10060)

2005: Unknown MySQL server host 'hostname' (11001)

PostgreSQL:

23505: duplicate key value violates unique constraint

23503：referential integrity violation

25P02：current transaction is aborted, commands ignored until end of transaction block

58030: I/O error occurred while reading from or writing to a file

Oracle:

00060: deadlock detected while waiting for resource

01017: invalid username/password; logon denied

03113：end-of-file on communication channel

03114：not connected to ORACLE

SQL Server:

4060: cannot open database requested in login 'database'. Login fails

18456: login failed for user 'username'

1205: transaction (process ID %d) was deadlocked on %.*ls resources with another process and has been chosen as the deadlock victim. Rerun the transaction