Merge remote-tracking branch 'upstream/master' into no-ivar-in-modules

* upstream/master: (671 commits)
  Make rubocop happy
  Use guard clause
  Improve language
  Prettify
  Use temp branch
  Pass info about who started the job and which job triggered it
  Docs: add indexes for monitoring and performance monitoring
  clearer-documentation-on-inline-diffs
  Add docs for commit diff discussion in merge requests
  sorting for tags api
  Clear BatchLoader after each spec to prevent holding onto records longer than necessary
  Include project in BatchLoader key to prevent returning blobs for the wrong project
  moved lfs_blob_ids method into ExtractsPath module
  Converted JS modules into exported modules
  spec fixes
  Bump gitlab-shell version to 5.10.3
  Clear caches before updating MR diffs
  Use new Ruby version 2.4 in GitLab QA images
  moved lfs blob fetch from extractspath file
  Update GitLab QA dependencies
  ...

3 files changed, 19 insertions, 55 deletions

diff --git a/lib/gitlab/metrics/method_call.rb b/lib/gitlab/metrics/method_call.rb
index 65d55576ac2..9112164f22e 100644
--- a/lib/gitlab/metrics/method_call.rb
+++ b/lib/gitlab/metrics/method_call.rb
@@ -1,7 +1,11 @@
+# rubocop:disable Style/ClassVars
+
 module Gitlab
   module Metrics
     # Class for tracking timing information about method calls
     class MethodCall
+      @@measurement_enabled_cache = Concurrent::AtomicBoolean.new(false)
+      @@measurement_enabled_cache_expires_at = Concurrent::AtomicFixnum.new(Time.now.to_i)
       MUTEX = Mutex.new
       BASE_LABELS = { module: nil, method: nil }.freeze
       attr_reader :real_time, :cpu_time, :call_count, :labels
@@ -18,6 +22,10 @@ module Gitlab
         end
       end
 
+      def self.measurement_enabled_cache_expires_at
+        @@measurement_enabled_cache_expires_at
+      end
+
       # name - The full name of the method (including namespace) such as
       #        `User#sign_in`.
       #
@@ -72,7 +80,14 @@ module Gitlab
       end
 
       def call_measurement_enabled?
-        Feature.get(:prometheus_metrics_method_instrumentation).enabled?
+        expires_at = @@measurement_enabled_cache_expires_at.value
+        if expires_at < Time.now.to_i
+          if @@measurement_enabled_cache_expires_at.compare_and_set(expires_at, 1.minute.from_now.to_i)
+            @@measurement_enabled_cache.value = Feature.get(:prometheus_metrics_method_instrumentation).enabled?
+          end
+        end
+
+        @@measurement_enabled_cache.value
       end
     end
   end
diff --git a/lib/gitlab/metrics/samplers/influx_sampler.rb b/lib/gitlab/metrics/samplers/influx_sampler.rb
index f4f9b5ca792..5a0f7f28fc8 100644
--- a/lib/gitlab/metrics/samplers/influx_sampler.rb
+++ b/lib/gitlab/metrics/samplers/influx_sampler.rb
@@ -27,7 +27,6 @@ module Gitlab
         def sample
           sample_memory_usage
           sample_file_descriptors
-          sample_objects
           sample_gc
 
           flush
@@ -48,29 +47,6 @@ module Gitlab
           add_metric('file_descriptors', value: System.file_descriptor_count)
         end
 
-        if Metrics.mri?
-          def sample_objects
-            sample = Allocations.to_hash
-            counts = sample.each_with_object({}) do |(klass, count), hash|
-              name = klass.name
-
-              next unless name
-
-              hash[name] = count
-            end
-
-            # Symbols aren't allocated so we'll need to add those manually.
-            counts['Symbol'] = Symbol.all_symbols.length
-
-            counts.each do |name, count|
-              add_metric('object_counts', { count: count }, type: name)
-            end
-          end
-        else
-          def sample_objects
-          end
-        end
-
         def sample_gc
           time = GC::Profiler.total_time * 1000.0
           stats = GC.stat.merge(total_time: time)
diff --git a/lib/gitlab/metrics/samplers/ruby_sampler.rb b/lib/gitlab/metrics/samplers/ruby_sampler.rb
index 436a9e9550d..b68800417a2 100644
--- a/lib/gitlab/metrics/samplers/ruby_sampler.rb
+++ b/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)
@@ -48,7 +48,6 @@ module Gitlab
         def sample
           start_time = System.monotonic_time
           sample_gc
-          sample_objects
 
           metrics[:memory_usage].set(labels, System.memory_usage)
           metrics[:file_descriptors].set(labels, System.file_descriptor_count)
@@ -68,41 +67,15 @@ module Gitlab
           end
         end
 
-        def sample_objects
-          list_objects.each do |name, count|
-            metrics[:objects_total].set(labels.merge(class: name), count)
-          end
-        end
-
-        if Metrics.mri?
-          def list_objects
-            sample = Allocations.to_hash
-            counts = sample.each_with_object({}) do |(klass, count), hash|
-              name = klass.name
-
-              next unless name
-
-              hash[name] = count
-            end
-
-            # Symbols aren't allocated so we'll need to add those manually.
-            counts['Symbol'] = Symbol.all_symbols.length
-            counts
-          end
-        else
-          def list_objects
-          end
-        end
-
         def worker_label
           return {} unless defined?(Unicorn::Worker)
 
           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