Only log number of published messages at INFO level

[koenvervloesem]

Description:

At INFO level, only log the number of published messages in the current scan period.

At DEBUG level, log the full messages.

Also change the default level to INFO.

Checklist:

• The pull request is done against the latest development branch
• Only one feature/fix was added per PR and the code change compiles without warnings
• I accept the DCO.

[1technophile]

Thanks