Sensu (https://github.com/sensu) is a simple, malleable monitoring/metrics bus that leverages AMQP and a slim evented ruby client/server. It's configuration management friendly, user friendly, and hacker friendly (MIT licensed). There are dozens of community-contributed checks and handlers, everything from HAProxy metrics to HipChat handlers. Come join SF DevOps to find out what you can do with Sensu!
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