GitPushService#perform_housekeeping has high WallTime compare with CPUTime on Sidekiq Workers
GitPushService#perform_housekeeping
execute some redis calls through our Gitlab::Redis
class which has no a proper pool size when executed from Sidekiq workers.
I think there is some contention to get a connection from pool, based that the default timeout for the pool it's 5 seconds, which is where the WallTime takes. So a solution will be to increase the pool size to the number of concurrent jobs.