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leveraging knowledge of past results #719
it's common with bosun to check some current value against a past value. for example median value of current hour compared to median value of the same hour of the same day, a week ago.
if in that past timeframe there was an outage, this distorts the logic: an outage or problem now might go undetected (and perhaps more unlikely: a good value now might be seen as bad and alerted on).
I want to have something a bit more intelligent. I'm not sure yet how it should look like, but here's some ideas: