Best Monitoring tool for OSX server [duplicate]

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http://serverfault.com – This question already has an answer here: What tool do you use to monitor your servers? 73 answers What are the best available monitoring tools for monitoring the OSX server. Sorry if this has been asked before, but I havent found good sources yet. And this is not just CPU,server etc., is it possible to have app level monitoring? (HowTos)