Notifications logged in cron until cleared

I have noticed repeated lines in messages:

Jan  4 23:25:01 turris crond[28069]: (root) CMDOUT (Working on message: 1609802489-27778)
...
Jan  4 23:30:01 turris crond[28448]: (root) CMDOUT (Working on message: 1609802489-27778)
...
Jan  4 23:35:01 turris crond[28863]: (root) CMDOUT (Working on message: 1609802489-27778)

those are results of noifications sent, in this case by dev-detect:

root@turris:/tmp/user_notify# ls -l *
1609802489-27778:
-rw-r--r--    1 root     root            95 Jan  5 00:21 message_cs
-rw-r--r--    1 root     root            86 Jan  5 00:21 message_en
-rw-r--r--    1 root     root             0 Jan  5 00:25 sent_by_email
-rw-r--r--    1 root     root             5 Jan  5 00:21 severity

when I cleared the notifications in reforis interface, those notifications disappeared.

Is it necessary to log existence of a notification every time it’s detected?