fatalmonitor: up the number of lines processed

It's a really silly solution, but since fenari is gone, you have to run it on
fluorine where logs are full of noise (404s, etc) so we need to grab more to get
any useful stats. This is especially important during logstash outages.

Change-Id: Ic7cd9cc40963db27a1cff3ad94e9a80c423a20f7