Created
October 9, 2012 20:59
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A quick Riemann stream to emit an event when X events are zero
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| (defn zero-for-count | |
| "A sliding window of the last n events, emitting an event when all are zero." | |
| [n & children] | |
| (let [window (ref (vec (repeat n nil)))] | |
| (fn [event] | |
| (dosync (alter window pop) | |
| (ref-set window (into [(:metric event)] @window))) | |
| (when (every? (fnil zero? 1) @window) | |
| (call-rescue | |
| (assoc event :description (str "Last " n " metrics have been zero!") :state "warning") | |
| children))))) |
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