This might be off topic to the list. We have Clam AV running on Fedora 30 with clamav-milter, clamav-0.101.4-1.fc30.x86_64, and sendmail. On one server the logwatch emails do send a daily recap as desired such as this stanza:
 --------------------- Clamav Begin ------------------------ 
 Viruses detected:
    Sanesecurity.Jurlbl.2a2f26.UNOFFICIAL:                 1 Time(s)
    Sanesecurity.Jurlbl.550e2a.UNOFFICIAL:                 1 Time(s)
    Sanesecurity.Jurlbl.66a5cd.UNOFFICIAL:                 1 Time(s)
    SecuriteInfo.com.Spam-3504.UNOFFICIAL:                 1 Time(s)
    SecuriteInfo.com.Spam-3953.UNOFFICIAL:                 1 Time(s)
    SecuriteInfo.com.Spam-4044.UNOFFICIAL:                 2 Time(s)
 ---------------------- Clamav End -------------------------

On the other server, logwatch only shows this (not the above):

 Messages quarantined by milter: [Occurrences >= 1]
     clamav-milter: quarantined by clamav-milter                         6 Time
         Total:  6

This config file is the same on both servers:
cat  /usr/share/logwatch/default.conf/services/clamav-milter.conf
##################################################################
#
# clamav script ver. 0.85.1 for Logwatch.
#
# Written by S. Schimkat <www.schimkat.dk>.
#
# Find latest version here: www.schimkat.dk/clamav
#
##################################################################

Title = "Clamav-milter"
LogFile = messages
# maillog retained for backwards compatibility, but may be deleted
# at a later time
LogFile = maillog
*OnlyService = clamav-milter
*RemoveHeaders

# To turnoff unmatched output set to 1
$clamav_ignoreunmatched = 0

# vi: shiftwidth=3 tabstop=3 et

Is there another config file for this that I'm missing? Side note, the URL above, www.schimkat.dk/clamav, is now 404 page not found.