policy: add query_window_offset configuration
#850
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Tests fixed in #851 |
The Nomad Autoscaler uses the current time as the end of the query window. This can cause instability, specially for strategies that only take the most recent data point into account, because the latest data may still be processing. `query_window_offset` defines a time offset applied to the query window to push it back in time. A short `query_window_offset` value can help with the unstable readings, and a long value can be used for predictive scaling based on historical data (for example, from `7d` ago).
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Rebased to pick-up test fixes |
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The Nomad Autoscaler uses the current time as the end of the query window. This can cause instability, specially for strategies that only take the most recent data point into account, because the latest data may still be processing.
query_window_offsetdefines a time offset applied to the query window to push it back in time. A shortquery_window_offsetvalue can help with the unstable readings, and a long value can be used for predictive scaling based on historical data (for example, from7dago).Closes #843.