Merge branch 'an-fix-histogram-bug' into 'master'

Fix for histogram corruption in Sidekiq

See merge request gitlab-org/gitlab-ce!32453

lib/gitlab/sidekiq_middleware/metrics.rb

@@ -35,7 +35,7 @@ module Gitlab
 
       def init_metrics
         {
-          sidekiq_jobs_completion_seconds: ::Gitlab::Metrics.histogram(:sidekiq_jobs_completion_seconds, 'Seconds to complete sidekiq job', buckets: SIDEKIQ_LATENCY_BUCKETS),
+          sidekiq_jobs_completion_seconds: ::Gitlab::Metrics.histogram(:sidekiq_jobs_completion_seconds, 'Seconds to complete sidekiq job', {}, SIDEKIQ_LATENCY_BUCKETS),
           sidekiq_jobs_failed_total:       ::Gitlab::Metrics.counter(:sidekiq_jobs_failed_total, 'Sidekiq jobs failed'),
           sidekiq_jobs_retried_total:      ::Gitlab::Metrics.counter(:sidekiq_jobs_retried_total, 'Sidekiq jobs retried'),
           sidekiq_running_jobs:            ::Gitlab::Metrics.gauge(:sidekiq_running_jobs, 'Number of Sidekiq jobs running', {}, :livesum)

spec/lib/gitlab/sidekiq_middleware/metrics_spec.rb

@@ -13,7 +13,7 @@ describe Gitlab::SidekiqMiddleware::Metrics do
     let(:running_jobs_metric) { double('running jobs metric') }
 
     before do
-      allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_jobs_completion_seconds, anything, anything).and_return(completion_seconds_metric)
+      allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_jobs_completion_seconds, anything, anything, anything).and_return(completion_seconds_metric)
       allow(Gitlab::Metrics).to receive(:counter).with(:sidekiq_jobs_failed_total, anything).and_return(failed_total_metric)
       allow(Gitlab::Metrics).to receive(:counter).with(:sidekiq_jobs_retried_total, anything).and_return(retried_total_metric)
       allow(Gitlab::Metrics).to receive(:gauge).with(:sidekiq_running_jobs, anything, {}, :livesum).and_return(running_jobs_metric)