What exactly does M/monit mean

You can try this: monit: check process without pidfile

check process vsftpd
 matching vsftpd
 start program = "/etc/init.d/vsftpd start"
 stop program = "/etc/init.d/vsftpd stop"

Alternatively you can follow the guide I put together using aforementioned init file. Created RPM to keep the system consistent across updates (via fpm). New init file has modified service name vsftpd-pid so you can keep vsftpd stopped and vsftpd-pid running.

Remember to change your monit start and stop commands too.

More info here: http://bemehow.github.com/2012/11/15/monit-vsftpd/

Hitting F1 or h will show you the key. But for reference, the default colors are:

CPU:

• Blue = Low priority threads
• Green = Normal priority threads
• Red = Kernel threads

Memory:

• Green = Used memory
• Blue = Buffers
• Yellow/Orange = Cache

There are a couple of different color-schemes available, you can see them through hitting F2.