Add performance indicator changes to Danger

danger/datateam/Dangerfile

@@ -6,14 +6,28 @@ DATA_WAREHOUSE_LABELS = [
   "Data Warehouse::Not Impacted"
 ].freeze
 
+FILE_PATH_REGEX = %r{((ee|jh)/)?config/metrics(/.+\.yml)}.freeze
+PERFORMANCE_INDICATOR_REGEX = %r{gmau|smau|paid_gmau|umau}.freeze
+
 CHANGED_SCHEMA_MESSAGE = <<~MSG
-Notification to the Data Team about changes to the db/structure.sql file, add label `Data Warehouse::Impact Check`.
+Notification to the Data Team about changes to files with possible impact on Data Warehouse, add label `Data Warehouse::Impact Check`.
 
 /label ~"Data Warehouse::Impact Check"
 
+The following files require a review:
+
 MSG
 
 db_schema_updated = !git.modified_files.grep(%r{\Adb/structure\.sql}).empty?
+
+metrics_definitions_files = git.modified_files.grep(FILE_PATH_REGEX)
+
+data_warehouse_impact_files = metrics_definitions_files.select do |file|
+  helper.changed_lines(file).grep(PERFORMANCE_INDICATOR_REGEX).any?
+end.compact
+
+data_warehouse_impact_files << 'db/structure.sql' if db_schema_updated
+
 no_data_warehouse_labels = (gitlab.mr_labels & DATA_WAREHOUSE_LABELS).empty?
 
-markdown(CHANGED_SCHEMA_MESSAGE) if db_schema_updated && no_data_warehouse_labels
+markdown(CHANGED_SCHEMA_MESSAGE + helper.markdown_list(data_warehouse_impact_files)) if data_warehouse_impact_files.any? && no_data_warehouse_labels