No new hooks added in 8.3 Below are recently added.

    jetpack_auth_cookie_samesite

    hook (filter): Filters the SameSite attribute to use in auth cookies.

    Source: modules/wpcom-block-editor/class-jetpack-wpcom-block-editor.php:433

    jetpack_disable_cross_site_auth_cookies

    hook (filter): Allow plugins to disable the cross-site auth cookies.

    Source: modules/wpcom-block-editor/class-jetpack-wpcom-block-editor.php:408

    jetpack_feature_feature_enabled

    hook (action): Fires when a specific Jetpack package feature is initalized using the Config package.

    Source: packages/config/src/class-config.php:139

    jetpack_get_file_for_environment

    hook (filter): Filters the URL for a file passed through the get_file_url_for_environment function.

    Source: packages/assets/src/class-assets.php:54

    jetpack_json_api_site_can_view_hosting

    hook (filter): Filter whether the Hosting section in Calypso should be available for site.

    Related to Modules:
    Source: sal/class.json-api-site-base.php:431

    jetpack_partner_subsidiary_id

    hook (filter): Allow to filter the partner subsidiary id.

    Source: packages/partner/src/class-partner.php:137

    jetpack_blocks_variation

    hook (filter): Allow customizing the variation of blocks in use on a site.

    Source: class.jetpack-gutenberg.php:753

    jetpack_xmlrpc_server_event

    hook (action): Happens on various request handling events in the Jetpack XMLRPC server.<p>The action combines several types of events:</p> <ul> <li>remote_authorize</li> <li>remote_provision</li> <li>get_user.</li> </ul>

    Source: packages/connection/legacy/class.jetpack-xmlrpc-server.php:228

    jetpack_authorize_ending_authorized

    hook (action): Action fired when the master user has been authorized.

    Source: packages/connection/src/class-manager.php:1782

    jetpack_authorize_ending_linked

    hook (action): Action fired when a secondary user has been authorized.

    Source: packages/connection/src/class-manager.php:1771