Add latest changes from gitlab-org/gitlab@14-6-stable-eev14.6.0-rc42

1 files changed, 59 insertions, 0 deletions

diff --git a/metrics_server/metrics_server.rb b/metrics_server/metrics_server.rb
new file mode 100644
index 00000000000..56fc20dcc9d
--- /dev/null
+++ b/metrics_server/metrics_server.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+require_relative '../config/boot'
+
+require_relative 'dependencies'
+
+class MetricsServer # rubocop:disable Gitlab/NamespacedClass
+  class << self
+    def spawn(target, metrics_dir:, wipe_metrics_dir: false, trapped_signals: [])
+      raise "The only valid target is 'sidekiq' currently" unless target == 'sidekiq'
+
+      pid = Process.fork
+
+      if pid.nil? # nil means we're inside the fork
+        # Remove any custom signal handlers the parent process had registered, since we do
+        # not want to inherit them, and Ruby forks with a `clone` that has the `CLONE_SIGHAND`
+        # flag set.
+        Gitlab::ProcessManagement.modify_signals(trapped_signals, 'DEFAULT')
+
+        server = MetricsServer.new(target, metrics_dir, wipe_metrics_dir)
+        # This rewrites /proc/cmdline, since otherwise tools like `top` will show the
+        # parent process `cmdline` which is really confusing.
+        $0 = server.name
+
+        server.start
+      else
+        Process.detach(pid)
+      end
+
+      pid
+    end
+  end
+
+  def initialize(target, metrics_dir, wipe_metrics_dir)
+    @target = target
+    @metrics_dir = metrics_dir
+    @wipe_metrics_dir = wipe_metrics_dir
+  end
+
+  def start
+    ::Prometheus::Client.configure do |config|
+      config.multiprocess_files_dir = @metrics_dir
+    end
+
+    FileUtils.mkdir_p(@metrics_dir, mode: 0700)
+    ::Prometheus::CleanupMultiprocDirService.new.execute if @wipe_metrics_dir
+
+    settings = Settings.new(Settings.monitoring[name])
+
+    exporter_class = "Gitlab::Metrics::Exporter::#{@target.camelize}Exporter".constantize
+    server = exporter_class.instance(settings, synchronous: true)
+
+    server.start
+  end
+
+  def name
+    "#{@target}_exporter"
+  end
+end