Do we still need Sidekiq Limit fetch?

We introduced Sidekiq Limit Fetch in GitLab 8.14, and as wild guess it's possible that this is leading to a lot of Redis cache misses (see Zendesk: https://gitlab.zendesk.com/agent/tickets/80999 for more details).

Do we still need this gem/feature? I see we don't even have it enabled on GitLab.com.

/cc: @DouweM, @smcgivern, @pcarranza