Merge branch 'revert-c5a9bc17' into 'master'

Revert "Merge branch '56850-add-new-unicorn-metrics' into 'master'"

See merge request gitlab-org/gitlab-ce!28483

(cherry picked from commit c775e88c0ec0e9916227a410cc09e2bbca4a92ce)

2334b077 Revert "Merge branch '56850-add-new-unicorn-metrics' into 'master'"

9 files changed, 29 insertions, 153 deletions

diff --git a/Gemfile b/Gemfile
index 19432758b34..1c77f8e9a8b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -407,7 +407,6 @@ gem 'health_check', '~> 2.6.0'
 # System information
 gem 'vmstat', '~> 2.3.0'
 gem 'sys-filesystem', '~> 1.1.6'
-gem 'sys-proctable', '~> 1.2'
 
 # SSH host key support
 gem 'net-ssh', '~> 5.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3dd1adb5f63..ddff7e56968 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -904,8 +904,6 @@ GEM
       httpclient (>= 2.4)
     sys-filesystem (1.1.6)
       ffi
-    sys-proctable (1.2.1)
-      ffi
     sysexits (1.2.0)
     temple (0.8.0)
     test-prof (0.2.5)
@@ -1211,7 +1209,6 @@ DEPENDENCIES
   stackprof (~> 0.2.10)
   state_machines-activerecord (~> 0.5.1)
   sys-filesystem (~> 1.1.6)
-  sys-proctable (~> 1.2)
   test-prof (~> 0.2.5)
   thin (~> 1.7.0)
   timecop (~> 0.8.0)
diff --git a/doc/administration/monitoring/prometheus/gitlab_metrics.md b/doc/administration/monitoring/prometheus/gitlab_metrics.md
index 48bd709a2b7..c243dd9edbb 100644
--- a/doc/administration/monitoring/prometheus/gitlab_metrics.md
+++ b/doc/administration/monitoring/prometheus/gitlab_metrics.md
@@ -43,11 +43,10 @@ The following metrics are available:
 | redis_ping_latency_seconds        | Gauge     | 9.4   | Round trip time of the redis ping |
 | user_session_logins_total         | Counter   | 9.4   | Counter of how many users have logged in |
 | upload_file_does_not_exist        | Counter   | 10.7 in EE, 11.5 in CE  | Number of times an upload record could not find its file |
-| failed_login_captcha_total        | Gauge | 11.0  | Counter of failed CAPTCHA attempts during login |
-| successful_login_captcha_total    | Gauge | 11.0  | Counter of successful CAPTCHA attempts during login |
-| unicorn_active_connections        | Gauge | 11.0  | The number of active Unicorn connections (workers) |
-| unicorn_queued_connections        | Gauge | 11.0  | The number of queued Unicorn connections |
-| unicorn_workers                   | Gauge | 11.11 | The number of Unicorn workers |
+| failed_login_captcha_total        | Gauge | 11.0 | Counter of failed CAPTCHA attempts during login |
+| successful_login_captcha_total    | Gauge | 11.0 | Counter of successful CAPTCHA attempts during login |
+| unicorn_active_connections        | Gauge | 11.0 | The number of active Unicorn connections (workers) |
+| unicorn_queued_connections        | Gauge | 11.0 | The number of queued Unicorn connections |
 
 ## Sidekiq Metrics available for Geo **[PREMIUM]**
 
@@ -101,10 +100,6 @@ Some basic Ruby runtime metrics are available:
 | ruby_file_descriptors                  | Gauge     | 11.1  | File descriptors per process |
 | ruby_memory_bytes                      | Gauge     | 11.1  | Memory usage by process |
 | ruby_sampler_duration_seconds_total    | Counter   | 11.1  | Time spent collecting stats |
-| ruby_process_cpu_seconds_total         | Gauge     | 11.11 | Total amount of CPU time per process |
-| ruby_process_max_fds                   | Gauge     | 11.11 | Maximum number of open file descriptors per process |
-| ruby_process_resident_memory_bytes     | Gauge     | 11.11 | Memory usage by process, measured in bytes |
-| ruby_process_start_time_seconds        | Gauge     | 11.11 | The elapsed time between system boot and the process started, measured in seconds |
 
 [GC.stat]: https://ruby-doc.org/core-2.3.0/GC.html#method-c-stat
 
diff --git a/lib/gitlab/metrics/samplers/ruby_sampler.rb b/lib/gitlab/metrics/samplers/ruby_sampler.rb
index 4d9c43f37e7..18a69321905 100644
--- a/lib/gitlab/metrics/samplers/ruby_sampler.rb
+++ b/lib/gitlab/metrics/samplers/ruby_sampler.rb
@@ -23,32 +23,25 @@ module Gitlab
         end
 
         def init_metrics
-          metrics = {
-            file_descriptors:               ::Gitlab::Metrics.gauge(with_prefix(:file, :descriptors), 'File descriptors used', labels, :livesum),
-            memory_bytes:                   ::Gitlab::Metrics.gauge(with_prefix(:memory, :bytes), 'Memory used', labels, :livesum),
-            process_cpu_seconds_total:      ::Gitlab::Metrics.gauge(with_prefix(:process, :cpu_seconds_total), 'Process CPU seconds total'),
-            process_max_fds:                ::Gitlab::Metrics.gauge(with_prefix(:process, :max_fds), 'Process max fds'),
-            process_resident_memory_bytes:  ::Gitlab::Metrics.gauge(with_prefix(:process, :resident_memory_bytes), 'Memory used', labels, :livesum),
-            process_start_time_seconds:     ::Gitlab::Metrics.gauge(with_prefix(:process, :start_time_seconds), 'Process start time seconds'),
-            sampler_duration:               ::Gitlab::Metrics.counter(with_prefix(:sampler, :duration_seconds_total), 'Sampler time', labels),
-            total_time:                     ::Gitlab::Metrics.counter(with_prefix(:gc, :duration_seconds_total), 'Total GC time', labels)
-          }
-
+          metrics = {}
+          metrics[:sampler_duration] = ::Gitlab::Metrics.counter(with_prefix(:sampler, :duration_seconds_total), 'Sampler time', labels)
+          metrics[:total_time] = ::Gitlab::Metrics.counter(with_prefix(:gc, :duration_seconds_total), 'Total GC time', labels)
           GC.stat.keys.each do |key|
             metrics[key] = ::Gitlab::Metrics.gauge(with_prefix(:gc_stat, key), to_doc_string(key), labels, :livesum)
           end
 
+          metrics[:memory_usage] = ::Gitlab::Metrics.gauge(with_prefix(:memory, :bytes), 'Memory used', labels, :livesum)
+          metrics[:file_descriptors] = ::Gitlab::Metrics.gauge(with_prefix(:file, :descriptors), 'File descriptors used', labels, :livesum)
+
           metrics
         end
 
         def sample
           start_time = System.monotonic_time
 
+          metrics[:memory_usage].set(labels.merge(worker_label), System.memory_usage)
           metrics[:file_descriptors].set(labels.merge(worker_label), System.file_descriptor_count)
-          metrics[:process_cpu_seconds_total].set(labels.merge(worker_label), ::Gitlab::Metrics::System.cpu_time)
-          metrics[:process_max_fds].set(labels.merge(worker_label), ::Gitlab::Metrics::System.max_open_file_descriptors)
-          metrics[:process_start_time_seconds].set(labels.merge(worker_label), ::Gitlab::Metrics::System.process_start_time)
-          set_memory_usage_metrics
+
           sample_gc
 
           metrics[:sampler_duration].increment(labels, System.monotonic_time - start_time)
@@ -68,14 +61,6 @@ module Gitlab
           metrics[:total_time].increment(labels, GC::Profiler.total_time)
         end
 
-        def set_memory_usage_metrics
-          memory_usage = System.memory_usage
-          memory_labels = labels.merge(worker_label)
-
-          metrics[:memory_bytes].set(memory_labels, memory_usage)
-          metrics[:process_resident_memory_bytes].set(memory_labels, memory_usage)
-        end
-
         def worker_label
           return {} unless defined?(Unicorn::Worker)
 
diff --git a/lib/gitlab/metrics/samplers/unicorn_sampler.rb b/lib/gitlab/metrics/samplers/unicorn_sampler.rb
index 1b6c52ac0bf..bec64e864b3 100644
--- a/lib/gitlab/metrics/samplers/unicorn_sampler.rb
+++ b/lib/gitlab/metrics/samplers/unicorn_sampler.rb
@@ -8,16 +8,12 @@ module Gitlab
           super(interval)
         end
 
-        def metrics
-          @metrics ||= init_metrics
+        def unicorn_active_connections
+          @unicorn_active_connections ||= ::Gitlab::Metrics.gauge(:unicorn_active_connections, 'Unicorn active connections', {}, :max)
         end
 
-        def init_metrics
-          {
-            unicorn_active_connections: ::Gitlab::Metrics.gauge(:unicorn_active_connections, 'Unicorn active connections', {}, :max),
-            unicorn_queued_connections: ::Gitlab::Metrics.gauge(:unicorn_queued_connections, 'Unicorn queued connections', {}, :max),
-            unicorn_workers:            ::Gitlab::Metrics.gauge(:unicorn_workers, 'Unicorn workers')
-          }
+        def unicorn_queued_connections
+          @unicorn_queued_connections ||= ::Gitlab::Metrics.gauge(:unicorn_queued_connections, 'Unicorn queued connections', {}, :max)
         end
 
         def enabled?
@@ -27,13 +23,14 @@ module Gitlab
 
         def sample
           Raindrops::Linux.tcp_listener_stats(tcp_listeners).each do |addr, stats|
-            set_unicorn_connection_metrics('tcp', addr, stats)
+            unicorn_active_connections.set({ socket_type: 'tcp', socket_address: addr }, stats.active)
+            unicorn_queued_connections.set({ socket_type: 'tcp', socket_address: addr }, stats.queued)
           end
+
           Raindrops::Linux.unix_listener_stats(unix_listeners).each do |addr, stats|
-            set_unicorn_connection_metrics('unix', addr, stats)
+            unicorn_active_connections.set({ socket_type: 'unix', socket_address: addr }, stats.active)
+            unicorn_queued_connections.set({ socket_type: 'unix', socket_address: addr }, stats.queued)
           end
-
-          metrics[:unicorn_workers].set({}, unicorn_workers_count)
         end
 
         private
@@ -42,13 +39,6 @@ module Gitlab
           @tcp_listeners ||= Unicorn.listener_names.grep(%r{\A[^/]+:\d+\z})
         end
 
-        def set_unicorn_connection_metrics(type, addr, stats)
-          labels = { socket_type: type, socket_address: addr }
-
-          metrics[:unicorn_active_connections].set(labels, stats.active)
-          metrics[:unicorn_queued_connections].set(labels, stats.queued)
-        end
-
         def unix_listeners
           @unix_listeners ||= Unicorn.listener_names - tcp_listeners
         end
@@ -56,10 +46,6 @@ module Gitlab
         def unicorn_with_listeners?
           defined?(Unicorn) && Unicorn.listener_names.any?
         end
-
-        def unicorn_workers_count
-          Sys::ProcTable.ps.select {|p| p.cmdline.match(/unicorn_rails worker.+ #{Rails.root.to_s}/)}.count
-        end
       end
     end
   end
diff --git a/lib/gitlab/metrics/system.rb b/lib/gitlab/metrics/system.rb
index ce0bb82d138..426496855e3 100644
--- a/lib/gitlab/metrics/system.rb
+++ b/lib/gitlab/metrics/system.rb
@@ -23,21 +23,6 @@ module Gitlab
         def self.file_descriptor_count
           Dir.glob('/proc/self/fd/*').length
         end
-
-        def self.max_open_file_descriptors
-          match = File.read('/proc/self/limits').match(/Max open files\s*(\d+)/)
-
-          return unless match && match[1]
-
-          match[1].to_i
-        end
-
-        def self.process_start_time
-          start_time_in_jiffies = Sys::ProcTable.ps(pid: Process.pid).starttime
-          return 0 unless start_time_in_jiffies
-
-          start_time_in_jiffies / 100
-        end
       else
         def self.memory_usage
           0.0
@@ -46,14 +31,6 @@ module Gitlab
         def self.file_descriptor_count
           0
         end
-
-        def self.max_open_file_descriptors
-          0
-        end
-
-        def self.process_start_time
-          0
-        end
       end
 
       # THREAD_CPUTIME is not supported on OS X
diff --git a/spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb b/spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb
index aaf8c9fa2a0..7972ff253fe 100644
--- a/spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb
+++ b/spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb
@@ -10,20 +10,17 @@ describe Gitlab::Metrics::Samplers::RubySampler do
 
   describe '#sample' do
     it 'samples various statistics' do
-      expect(Gitlab::Metrics::System).to receive(:cpu_time)
-      expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
       expect(Gitlab::Metrics::System).to receive(:memory_usage)
-      expect(Gitlab::Metrics::System).to receive(:process_start_time)
-      expect(Gitlab::Metrics::System).to receive(:max_open_file_descriptors)
+      expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
       expect(sampler).to receive(:sample_gc)
 
       sampler.sample
     end
 
-    it 'adds a metric containing the process resident memory bytes' do
+    it 'adds a metric containing the memory usage' do
       expect(Gitlab::Metrics::System).to receive(:memory_usage).and_return(9000)
 
-      expect(sampler.metrics[:process_resident_memory_bytes]).to receive(:set).with({}, 9000)
+      expect(sampler.metrics[:memory_usage]).to receive(:set).with({}, 9000)
 
       sampler.sample
     end
@@ -37,27 +34,6 @@ describe Gitlab::Metrics::Samplers::RubySampler do
       sampler.sample
     end
 
-    it 'adds a metric containing the process total cpu time' do
-      expect(Gitlab::Metrics::System).to receive(:cpu_time).and_return(0.51)
-      expect(sampler.metrics[:process_cpu_seconds_total]).to receive(:set).with({}, 0.51)
-
-      sampler.sample
-    end
-
-    it 'adds a metric containing the process start time' do
-      expect(Gitlab::Metrics::System).to receive(:process_start_time).and_return(12345)
-      expect(sampler.metrics[:process_start_time_seconds]).to receive(:set).with({}, 12345)
-
-      sampler.sample
-    end
-
-    it 'adds a metric containing the process max file descriptors' do
-      expect(Gitlab::Metrics::System).to receive(:max_open_file_descriptors).and_return(1024)
-      expect(sampler.metrics[:process_max_fds]).to receive(:set).with({}, 1024)
-
-      sampler.sample
-    end
-
     it 'clears any GC profiles' do
       expect(GC::Profiler).to receive(:clear)
 
diff --git a/spec/lib/gitlab/metrics/samplers/unicorn_sampler_spec.rb b/spec/lib/gitlab/metrics/samplers/unicorn_sampler_spec.rb
index 090e456644f..4b03f3c2532 100644
--- a/spec/lib/gitlab/metrics/samplers/unicorn_sampler_spec.rb
+++ b/spec/lib/gitlab/metrics/samplers/unicorn_sampler_spec.rb
@@ -39,8 +39,8 @@ describe Gitlab::Metrics::Samplers::UnicornSampler do
         it 'updates metrics type unix and with addr' do
           labels = { socket_type: 'unix', socket_address: socket_address }
 
-          expect(subject.metrics[:unicorn_active_connections]).to receive(:set).with(labels, 'active')
-          expect(subject.metrics[:unicorn_queued_connections]).to receive(:set).with(labels, 'queued')
+          expect(subject).to receive_message_chain(:unicorn_active_connections, :set).with(labels, 'active')
+          expect(subject).to receive_message_chain(:unicorn_queued_connections, :set).with(labels, 'queued')
 
           subject.sample
         end
@@ -50,6 +50,7 @@ describe Gitlab::Metrics::Samplers::UnicornSampler do
     context 'unicorn listens on tcp sockets' do
       let(:tcp_socket_address) { '0.0.0.0:8080' }
       let(:tcp_sockets) { [tcp_socket_address] }
+
       before do
         allow(unicorn).to receive(:listener_names).and_return(tcp_sockets)
       end
@@ -70,29 +71,13 @@ describe Gitlab::Metrics::Samplers::UnicornSampler do
         it 'updates metrics type unix and with addr' do
           labels = { socket_type: 'tcp', socket_address: tcp_socket_address }
 
-          expect(subject.metrics[:unicorn_active_connections]).to receive(:set).with(labels, 'active')
-          expect(subject.metrics[:unicorn_queued_connections]).to receive(:set).with(labels, 'queued')
+          expect(subject).to receive_message_chain(:unicorn_active_connections, :set).with(labels, 'active')
+          expect(subject).to receive_message_chain(:unicorn_queued_connections, :set).with(labels, 'queued')
 
           subject.sample
         end
       end
     end
-
-    context 'additional metrics' do
-      let(:unicorn_workers) { 2 }
-
-      before do
-        allow(unicorn).to receive(:listener_names).and_return([""])
-        allow(::Gitlab::Metrics::System).to receive(:cpu_time).and_return(3.14)
-        allow(subject).to receive(:unicorn_workers_count).and_return(unicorn_workers)
-      end
-
-      it "sets additional metrics" do
-        expect(subject.metrics[:unicorn_workers]).to receive(:set).with({}, unicorn_workers)
-
-        subject.sample
-      end
-    end
   end
 
   describe '#start' do
diff --git a/spec/lib/gitlab/metrics/system_spec.rb b/spec/lib/gitlab/metrics/system_spec.rb
index b0603d96eb2..14afcdf5daa 100644
--- a/spec/lib/gitlab/metrics/system_spec.rb
+++ b/spec/lib/gitlab/metrics/system_spec.rb
@@ -13,18 +13,6 @@ describe Gitlab::Metrics::System do
         expect(described_class.file_descriptor_count).to be > 0
       end
     end
-
-    describe '.max_open_file_descriptors' do
-      it 'returns the max allowed open file descriptors' do
-        expect(described_class.max_open_file_descriptors).to be > 0
-      end
-    end
-
-    describe '.process_start_time' do
-      it 'returns the process start time' do
-        expect(described_class.process_start_time).to be > 0
-      end
-    end
   else
     describe '.memory_usage' do
       it 'returns 0.0' do
@@ -37,18 +25,6 @@ describe Gitlab::Metrics::System do
         expect(described_class.file_descriptor_count).to eq(0)
       end
     end
-
-    describe '.max_open_file_descriptors' do
-      it 'returns 0' do
-        expect(described_class.max_open_file_descriptors).to eq(0)
-      end
-    end
-
-    describe 'process_start_time' do
-      it 'returns 0' do
-        expect(described_class.process_start_time).to eq(0)
-      end
-    end
   end
 
   describe '.cpu_time' do