1 files changed, 41 insertions, 0 deletions
diff --git a/lib/gitlab/usage/service_ping/instrumented_payload.rb b/lib/gitlab/usage/service_ping/instrumented_payload.rb
new file mode 100644
index 00000000000..e04e2e589b2
--- /dev/null
+++ b/lib/gitlab/usage/service_ping/instrumented_payload.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+# Service Ping payload build using the instrumentation classes
+# for given metrics key_paths and output method
+module Gitlab
+  module Usage
+    module ServicePing
+      class InstrumentedPayload
+        attr_reader :metrics_key_paths
+        attr_reader :output_method
+
+        def initialize(metrics_key_paths, output_method)
+          @metrics_key_paths = metrics_key_paths
+          @output_method = output_method
+        end
+
+        def build
+          metrics_key_paths.map do |key_path|
+            compute_instrumental_value(key_path, output_method)
+          end.reduce({}, :deep_merge)
+        end
+
+        private
+
+        # Not all metrics defintions have instrumentation classes
+        # The value can be computed only for those that have it
+        def instrumented_metrics_defintions
+          Gitlab::Usage::MetricDefinition.with_instrumentation_class
+        end
+
+        def compute_instrumental_value(key_path, output_method)
+          definition = instrumented_metrics_defintions.find { |df| df.key_path == key_path }
+
+          return {} unless definition.present?
+
+          Gitlab::Usage::Metric.new(definition).method(output_method).call
+        end
+      end
+    end
+  end
+end