Merge branch 'pawel/update-prometheus_gem_to_highly_optimized_version-10-2' into…

app/services/metrics_service.rb

@@ -20,7 +20,7 @@ class MetricsService
   end
 
   def metrics_text
-    "#{health_metrics_text}#{prometheus_metrics_text}"
+    prometheus_metrics_text.concat(health_metrics_text)
   end
 
   private

config/initializers/7_prometheus_metrics.rb

@@ -11,15 +11,7 @@ Prometheus::Client.configure do |config|
     config.multiprocess_files_dir ||= Rails.root.join('tmp/prometheus_multiproc_dir')
   end
 
-  config.pid_provider = -> do
-    wid = Prometheus::Client::Support::Unicorn.worker_id
-    wid = Process.pid if wid.nil?
-    if wid.nil?
-      "process_pid_#{Process.pid}"
-    else
-      "worker_id_#{wid}"
-    end
-  end
+  config.pid_provider = Prometheus::Client::Support::Unicorn.method(:worker_pid_provider)
 end
 
 Sidekiq.configure_server do |config|

lib/gitlab/metrics/samplers/ruby_sampler.rb

@@ -32,7 +32,7 @@ module Gitlab
 
         def init_metrics
           metrics = {}
-          metrics[:sampler_duration] = Metrics.histogram(with_prefix(:sampler_duration, :seconds), 'Sampler time', {})
+          metrics[:sampler_duration] = Metrics.histogram(with_prefix(:sampler_duration, :seconds), 'Sampler time', { worker: nil })
           metrics[:total_time] = Metrics.gauge(with_prefix(:gc, :time_total), 'Total GC time', labels, :livesum)
           GC.stat.keys.each do |key|
             metrics[key] = Metrics.gauge(with_prefix(:gc, key), to_doc_string(key), labels, :livesum)
@@ -99,9 +99,9 @@ module Gitlab
           worker_no = ::Prometheus::Client::Support::Unicorn.worker_id
 
           if worker_no
-            { unicorn: worker_no }
+            { worker: worker_no }
           else
-            { unicorn: 'master' }
+            { worker: 'master' }
           end
         end
       end