Как настроить Munin, чтобы он отправлял critical/warning на E-Mail?

Question

[Анатолий]

Debian 9, Munin 2.0.33-1
К примеру плагин my_cpu имеет такой кусок кода:

echo 'graph_title CPU usage'
        echo 'graph_vlabel CPU'
        echo 'graph_category system'
        echo 'graph_info This graph shows total CPU usage.'

        echo 'graph_args --base 1000 -l 0'
        echo 'cpu.label % usage CPU'
        echo 'cpu.draw AREA'
        echo 'cpu.info The total percent CPU usage.'
        echo 'cpu.warning 2'
        echo 'cpu.critical 5'
        exit 0

И в munin.conf есть такой кусок кода

[Web-server]
   address 127.0.0.1
   use_node_name yes

   #   my_cpu.cpu.warning 2
   #   my_cpu.cpu.critical 5

   contacts warn crit

   contact.warn.command echo "Munin Warning!" | mail -s "Munin Warning!" [e-mail] -a "Content-Type: text/plain; charset=UTF-8"
   contact.crit.command echo "Munin Critical!" | mail -s "Munin Critical!" [e-mail] -a "Content-Type: text/plain; charset=UTF-8"

   contact.warn.always_send warning
   contact.crit.always_send critical