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[thanos][production] - enable auto downsampling

Nick Duff requested to merge nduff/thanos-downsampling into master

What

  • Enables auto downsampling on thanos

Why

By default thanos only returns raw data, enabling auto-downsampling will allow thanos to attempt to auto calculate the correct step to use.

This should only affect queries run directly through the thanos UI, as within grafana we already set auto downsampling by the datasource query params: max_source_resolution=auto&partial_response=true

Related Issue: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/19907

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