Monit alert - Resource limit matched

[anym001]

I have executed the command "killall crowdsec".
12834 of 13158 are processes by the name "notification-*".

How can I stop these processes?

"kill 12834" and keep the most recent.

Do I understand correctly that I now have to stop each individual process (12834 in total)?
How do I know which process is the last one?