Bug 30577

# grep -v '^#' /etc/monitrc

set daemon  60              # check services at 1-minute intervals
set httpd port 2812 and
    use address localhost  # only accept connection from localhost
    allow localhost        # allow localhost to connect to the server and
    allow admin:monit      # require user 'admin' with password 'monit'
    allow @monit           # allow users of group 'monit' to connect (rw)
    allow @users readonly  # allow users of group 'users' to connect readonly

set daemon 300 with start delay 60
set logfile syslog facility log_daemon
set statefile /var/run/monit.state
set idfile /var/run/monit.id
set mailserver localhost
set alert root@localhost

set mail-format {
        from: root@localhost
        subject: [monit] -- $SERVICE $EVENT on $HOST at $DATE
        message:
}

set httpd port 2812 and use the address localhost
        allow localhost
        allow monit:secretword

include /etc/monitrc.d/*

Может дублирующиеся параметры в дефолтном конфиге - это не совсем нормально?