The Wayback Machine - https://web.archive.org/web/20210812102103/https://developer.jetpack.com/module/masterbar/

    Browsing hooks for feature:

    jetpack_show_wpcom_upgrades_email_menu

    hook (filter): Whether to show the WordPress.com Emails submenu under the main Upgrades menu.

    Related to Modules:
    Source: modules/masterbar/admin-menu/class-atomic-admin-menu.php:268

    jetpack_admin_menu_use_calypso_links

    hook (filter): Whether links should point to Calypso or wp-admin.<p>Options: true - Calypso. false - wp-admin.</p>

    Related to Modules:
    Source: modules/masterbar/admin-menu/class-admin-menu.php:93

    wp_masterbar_logout

    hook (action): Hook into the log out event happening from the Masterbar.

    Related to Modules:
    Source: modules/masterbar/masterbar/class-masterbar.php:241