[thanos][production] - enable auto downsampling
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