Random failure in cycle_analytics_events_spec

See https://gitlab.com/gitlab-org/gitlab-ce/builds/6502899

  1) cycle analytics events GET /:namespace/:project/cycle_analytics/events/issues lists the code events
     Failure/Error: expect(json_response['events'].first['iid']).to eq(first_mr_iid)

       expected: "3"
            got: "2"

       (compared using ==)
     # ./spec/requests/projects/cycle_analytics_events_spec.rb:45:in `block (3 levels) in <top (required)>'