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wp-content/plugins/jetpack-boost/app/contracts/interface-feature.php

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+<?php
+
+namespace Automattic\Jetpack_Boost\Contracts;
+
+/**
+ * Every plugin feature that's large enough
+ * to need setup also needs a slug
+ */
+interface Feature extends Has_Setup, Has_Slug {
+	/**
+	 * Whether the feature is available for use.
+	 * Use this to check for feature flags, etc.
+	 *
+	 * @return bool
+	 */
+	public static function is_available();
+}