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Resolve "Exempt some tables from sharding key requirements"

Manoj M J requested to merge 443427-exempt-some-tables-from-sharding-key-requirements into master

What does this MR do and why?

Some tables we have today can be exempted from having a sharding key.

For example:

  • JiHu specific tables have no data on the gitlab.com database, and hence can be exempted from the requirement of having a sharding key or desired sharding key set.

Implementation plan:

  • Introduce a keyword in the yml like exempted_from_sharding: true, to identify such tables are exempted. --> This MR accomplishes this
  • Such exempted tables should be avoided from being counted in our dashboards. --> This will be accomplished in a follow-up MR in the dashboard repo.

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Related to #443427 (closed)

Edited by Manoj M J

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