Expand runbook on deleting series from Thanos

Bob Van Landuytrequested to merge
bvl-generate-deletion-config into master

This adds our latest findings to the runbook on deleting series from Thanos:

  • Removing downsamples blocks
  • Generating the config for the removal
  • Rewriting the deletion time in the markers.

For https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16424

Edited by Bob Van Landuyt

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