Mehdi Abaakouk b3874c47f1 Allow to extends the evaluator lookback window
Sometimes alarm state is flapping we just missing the last datapoint
often. This can be solved by increase dedicated to the metric injection
chain or for less critical scenario, we could allow a bigger lookback window.

This change allows to extends the lookback window with the new
configuration option 'acceptable_ingestion_lag'.

Change-Id: If2aca73aea95c0c6d08afa5fbb89b949099507db
Closes-bug: #1540298
Closes-bug: #1506911
2016-08-01 09:02:47 +02:00
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