1 files changed, 23 insertions, 0 deletions
diff --git a/lib/gitlab/metrics/dashboard/validator/custom_formats.rb b/lib/gitlab/metrics/dashboard/validator/custom_formats.rb
new file mode 100644
index 00000000000..485e80ad1b7
--- /dev/null
+++ b/lib/gitlab/metrics/dashboard/validator/custom_formats.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Metrics
+    module Dashboard
+      module Validator
+        class CustomFormats
+          def format_handlers
+            # Key is custom JSON Schema format name. Value is a proc that takes data and schema and handles
+            # validations.
+            @format_handlers ||= {
+              "add_to_metric_id_cache" => ->(data, schema) { metric_ids_cache << data }
+            }
+          end
+
+          def metric_ids_cache
+            @metric_ids_cache ||= []
+          end
+        end
+      end
+    end
+  end
+end