Add anchored and smoothed to vector selectors. #16457
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Hi @roidelapluie, I have a question about From what I understand:
Does the Could you clarify how |
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Design doc coming but shortly: anchored changes the underlying vector so that "increase" does not extrapolate. Therefore you have the result without extrapolation. |
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Proposal: prometheus/proposals#52 |
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**This "PoC" is not finished not optimized. It currently also returns data when there is only one point in the selector. It is not ready for use and just there to play around** This adds "anchored" and "smoothed" keywords that can be used following a matrix selector. "Anchored" selects the last point before the range (or the first one after the range) and adds it at the boundary of the matrix selector. "Smoothed" applies linear interpolation at the edges using the points around the edges. In the absence of a point before or after the edge, the first or the last point is added to the edge, without interpolation. A complete design doc will follow. *Exemple usage* * `increase(caddy_http_requests_total[5m] anchored)` (equivalent of *caddy_http_requests_total - caddy_http_requests_total offset 5m* but takes counter reset into consideration) * `rate(caddy_http_requests_total[5m] smoothed)` Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com>
This "PoC" is not finished nor optimized. It currently also returns data when there is only one point in the selector. It is not ready for use and just there to play around
This adds "anchored" and "smoothed" keywords that can be used following a matrix selector.
"Anchored" selects the last point before the range (or the first one after the range) and adds it at the boundary of the matrix selector.
"Smoothed" applies linear interpolation at the edges using the points around the edges. In the absence of a point before or after the edge, the first or the last point is added to the edge, without interpolation.
A complete design doc will follow.
Exemple usage
increase(caddy_http_requests_total[5m] anchored)(equivalent ofcaddy_http_requests_total - caddy_http_requests_total offset 5mbut takes counter reset into consideration)rate(caddy_http_requests_total[5m] smoothed)Other limitations
Does not work with Subqueries and Native Histograms.