I would like to know in CF, how to integrate with 3rd party app logging
and monitoring like Graphite, Nagios, etc, what is the recommended
approach. I found few articles where its mentioned firehose is the better
option. Whereas I remember having collector (stats_z1/z2) job pointing to
such monitoring server works well. So what steps I need to follow if I have
to integrate such application monitoring tool using firehose? Do I need to
write Nozzles for my monitoring tool like CloudCredo did for Graphite?
https://github.com/CloudCredo/graphite-nozzle
http://www.cloudcredo.com/how-to-integrate-graphite-with-cloud-foundry/
So if I have to integrate with Nagios, Wily, Splunk etc I would need
nozzle for all of them? If not what changes I need to do in my
configuration and in buildpack(not sure)?

I also found NOAA client https://github.com/cloudfoundry/noaa which I
think consumes all logs from doppler and show them on console? How this
Noaa client is using firehose, is not very clear in the document?