newsupernova/vendor/magento/module-layered-navigation/etc/adminhtml/events.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="product_attribute_form_build_front_tab">
        <observer name="layeredNavigation" instance="Magento\LayeredNavigation\Observer\Edit\Tab\Front\ProductAttributeFormBuildFrontTabObserver" />
    </event>
    <event name="product_attribute_grid_build">
        <observer name="layeredNavigation" instance="Magento\LayeredNavigation\Observer\Grid\ProductAttributeGridBuildObserver" />
    </event>
</config>