When you enable Compact_Filter=dbnames.nsf; dbnames2.nsf, you'll see all the additional messages indicating that the database is not present in the ini parameter 'Compact_filter' for all the rest of the databases:
[042C:0004-13B4] 2021/01/28 18:09:27 Compacting iNotes\Forms9.nsf (HCL iNotes Common Forms (11)),
[042C:0004-13B4] Database 'lndfr.nsf' is not present in the ini parameter 'COMPACT_FILTER'. Proceeding with compact.
[042C:0004-13B4] 2021/01/28 18:09:56 Compacted iNotes\Forms9.nsf, 0K bytes recovered (0%),
[042C:0004-13B4] Database 'lndsutr.nsf' is not present in the ini parameter 'COMPACT_FILTER'. Proceeding with compact.
[042C:0004-13B4] 2021/01/28 18:09:56 Compacting lndfr.nsf (HCL Notes/Domino Fault Reports),
[042C:0004-13B4] 2021/01/28 18:09:56 Compacted lndfr.nsf, 0K bytes recovered (0%),
[042C:0004-13B4] Database 'log.nsf' is not present in the ini parameter 'COMPACT_FILTER'. Proceeding with compact.
[042C:0004-13B4] Database 'mail\admin.nsf' is not present in the ini parameter 'COMPACT_FILTER'. Proceeding with compact.
Request a feature to turn off excessive logging generated on log.nsf and console.log.
You can disable those messages by setting the notes.ini variable: compact_filter_log_disabled=1