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* Add anchored and smoothed to vector selectors. 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. *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[step()] smoothed)` Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> * Update docs/feature_flags.md Co-authored-by: Charles Korn <charleskorn@users.noreply.github.com> Signed-off-by: Julien <291750+roidelapluie@users.noreply.github.com> * Smoothed/Anchored rate: Add more tests Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> * Anchored/Smoothed modifier: error out with histograms Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> --------- Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> Signed-off-by: Julien <291750+roidelapluie@users.noreply.github.com> Co-authored-by: Charles Korn <charleskorn@users.noreply.github.com>