25 files declare their use of Action in Business Rules 2.x

ActionSet.php in src/Plugin/BusinessRulesAction/ActionSet.php

ActionSetController.php in src/Controller/ActionSetController.php

AutocompleteTags.php in src/Controller/AutocompleteTags.php

BusinessRuleForm.php in src/Form/BusinessRuleForm.php

BusinessRulesItemObject.php in src/BusinessRulesItemObject.php

BusinessRulesItemsController.php in src/Controller/BusinessRulesItemsController.php

BusinessRulesProcessor.php in src/Util/BusinessRulesProcessor.php

BusinessRulesUtil.php in src/Util/BusinessRulesUtil.php

business_rules.install in ./business_rules.install

ChangeFieldInfo.php in src/Plugin/BusinessRulesAction/ChangeFieldInfo.php

ConditionForm.php in src/Form/ConditionForm.php

ConditionsItemsController.php in src/Controller/ConditionsItemsController.php

ConfigEntityCalculateDependencyTest.php in tests/src/Unit/ConfigEntityCalculateDependencyTest.php

FetchEntityVariableAction.php in src/Plugin/BusinessRulesAction/FetchEntityVariableAction.php

FillEntityVariableFields.php in src/Plugin/BusinessRulesAction/FillEntityVariableFields.php

Flowchart.php in src/Util/Flowchart/Flowchart.php

ItemForm.php in src/Form/ItemForm.php

LoopThroughFieldVariable.php in src/Plugin/BusinessRulesAction/LoopThroughFieldVariable.php

LoopThroughViewResult.php in src/Plugin/BusinessRulesAction/LoopThroughViewResult.php

LoopThroughViewResultController.php in src/Controller/LoopThroughViewResultController.php

SaveEntityVariableAction.php in src/Plugin/BusinessRulesAction/SaveEntityVariableAction.php

ScheduleController.php in src/Controller/ScheduleController.php

ScheduleTask.php in src/Plugin/BusinessRulesAction/ScheduleTask.php

ScheduleTaskController.php in src/Controller/ScheduleTaskController.php

VariableForm.php in src/Form/VariableForm.php