Evaluated it and a couple of others. Chose Bosun, never looked back, it's probably the only system with flexible and concise DSL for evaluating alerts (somewhat similar to R in spirit).
How do you know actually? A lot changed in past 4-5 years, having a soldier with a black eye is a whole lot of trouble for commanding officers and they sometimes take ridiculous measures to prevent that. Of course it's not same everywhere, but it's army after all.
People should at least try to see forest behind trees. It's not only cows or only almonds. The reason land dies is very complex one, mostly because ecosystems become unbalanced through abuse by CAFO and unsustainable farming.
We've just finished migrating our ELK stack from cloud VPS'es to bare metal to cut costs. I was and still impressed how smooth that went including upgrading from 0.9x to 1.4
It's better because given the same input you always get the same output. For example, in Gentoo when one builds a package the final result depends on what's been built before. Or (killer feature for configuration management):
Suppose one has a resource for file in Puppet
file "blah" do
source "yada"
end
if you erase that resource, the file still stays there. With Nix/Guix anything not defined in configuration isn't present at all on system.
Another feature : one can install, for example, different versions of Python/PyPy/etc locally using the same package manager. Local and system-wide package share the same underlying files and don't interfere.
Rollbacks, very easy way to restore system packages/configs to previous working state.
We've had a 3rd party router configured to balance traffic based on even/odd last octet. Add faulty hardware and DHCP to the mix, and here you have really hard to debug problem.
Riemann rocks, just not as monitoring system.
Bosun link: http://bosun.org/