Projects::BranchesController#index: Gitaly timeout error

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Problem

For large repositories like GitLab, branches page takes a while to load: https://gitlab.com/gitlab-org/gitlab/-/branches.

In some cases Gitaly response triggers a fast_timeout (10 seconds) and cancels the response:

https://log.gprd.gitlab.net/app/r/s/UAory

FindAllBranches method can be slow

How to reproduce

https://gitlab.com/gitlab-org/gitlab/-/branches?state=all&sort=updated_desc&search=17-11-stable

Proposal

Investigate options to improve the performance. Potential ideas:

1. Add limits on FindAllBranches
2. Explore other endpoints to get a list of branches
3. Check if FindAllBranches is necessary

Related issues

• Improve performance of index action for Branche... (#211710 - closed)
• Gitlab::Git::CommandError: 4:Deadline Exceeded ... (#213388 - closed)