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Add storage watermark to zoekt indices

John Mason requested to merge jm-zoekt-index-reserved-storage-watermark into master

What does this MR do and why?

This will update zoekt indices to have a watermarked state whenever their total storage usage goes over a watermark compared to their reserved storage.

Relates to &14886

Query Plan

  1. https://console.postgres.ai/gitlab/gitlab-production-main/sessions/32127/commands/99413
SELECT "zoekt_indices".* FROM "zoekt_indices" WHERE "zoekt_indices"."watermark_level" != 60 AND (reserved_storage_bytes > 0) AND ((used_storage_bytes / reserved_storage_bytes::double precision) >= 0.85)
  1. https://console.postgres.ai/gitlab/gitlab-production-main/sessions/32127/commands/99412
SELECT "zoekt_indices".* FROM "zoekt_indices" WHERE "zoekt_indices"."watermark_level" NOT IN (30, 60) AND "zoekt_indices"."reserved_storage_bytes" > 0 AND ((used_storage_bytes / reserved_storage_bytes::double precision) >= 0.7)

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Edited by John Mason

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