Commits on Dec 2, 2015

1. promql: Limit extrapolation of delta/rate/increase …

   Currenty the extrapolation is always done no matter
   how much of the range is covered by samples.
   When a time-series appears or disappears this can lead
   to significant artifacts. Instead only extrapolate if
   the first/last sample is within 110% of the expected place
   we'd see the next sample's timestamp.
   
   This will still result in artifacts for appearing and disappearing
   timeseries, but they should be limited to +110% of the true value.
   
   Fixes #581

   

   brian-brazil committed Dec 2, 2015
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