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Implement query pushdown for a subset of aggregations
Certain aggregations can be executed safely on leaf nodes without worrying about data duplication or overlap. One such example is the max function which can be computed on local data by the leaves before it is computed globally by the querier. This commit implements local aggregation in the Prometheus sidecar for all functions which are safe to execute locally. The feature can be enabled by passing the `--enable-feature evaluate-queries` flag to the sidecar. Signed-off-by: fpetkovski <filip.petkovsky@gmail.com>
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