N+1 Projects::CompareController#show

Corresponding gitlab-rails issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/37430

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Stages:

• Investigate

• Assess priority

• Server-side fixed #1047 (closed)

• Client-side fixed https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17439

Affected RPC's:

• BlobService::TreeEntry
• BlobService::GetBlob

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Process explanation:

Investigate

If it's not clear what RPC's add up to the N+1 violation, do a new CI run on gitlab-ce/ee to find out.

Assess priority

• Does this N+1 degrade the user experience?
• Does it cause more than 100 (extra) requests per second on gitlab.com?

If the answer to both questions is 'no' then downgrade the priority of this issue to v1.1.

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