1 files changed, 34 insertions, 0 deletions
diff --git a/lib/gitlab/metrics/boot_time_tracker.rb b/lib/gitlab/metrics/boot_time_tracker.rb
new file mode 100644
index 00000000000..3e7026b8dea
--- /dev/null
+++ b/lib/gitlab/metrics/boot_time_tracker.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Metrics
+    class BootTimeTracker
+      include Singleton
+
+      SUPPORTED_RUNTIMES = [:puma, :sidekiq, :console].freeze
+
+      def startup_time
+        @startup_time || 0
+      end
+
+      def track_boot_time!(logger: Gitlab::AppJsonLogger)
+        return if @startup_time
+
+        runtime = Gitlab::Runtime.safe_identify
+        return unless SUPPORTED_RUNTIMES.include?(runtime)
+
+        @startup_time = Gitlab::Metrics::System.process_runtime_elapsed_seconds
+
+        Gitlab::Metrics.gauge(
+          :gitlab_rails_boot_time_seconds, 'Time elapsed for Rails primary process to finish startup'
+        ).set({}, @startup_time)
+
+        logger.info(message: 'Application boot finished', runtime: runtime.to_s, duration_s: @startup_time)
+      end
+
+      def reset!
+        @startup_time = nil
+      end
+    end
+  end
+end