No new hooks added in 8.9.1 Below are recently added.

    jetpack_activated_plugin

    hook (action): Fires when Jetpack installs a plugin for you.

    Source: _inc/lib/class.core-rest-api-endpoints.php:3668

    jetpack_contact_form_in_comment_disallowed_list

    hook (filter): Filter whether a submitted contact form is in the comment disallowed list.

    Source: modules/contact-form/grunion-contact-form.php:2754

    jetpack_connection_error_notice

    hook (action): Fires inside the admin_notices hook just before displaying the error message for a broken connection.<p>If you want to disable the default message from being displayed, return an emtpy value in the jetpack_connection_error_notice_message filter.</p>

    Source: vendor/automattic/jetpack-connection/src/class-error-handler.php:651

    jetpack_connection_error_notice_message

    hook (filter): Filters the message to be displayed in the admin notices area when there's a xmlrpc error.<p>By default we don't display any errors.</p> <p>Return an empty value to disable the message.</p>

    Source: vendor/automattic/jetpack-connection/src/class-error-handler.php:640

    jetpack_lazy_load_get_file_for_environment

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

    Source: vendor/automattic/jetpack-lazy-images/src/lazy-images.php:128

    jetpack_lazy_images_is_amp_request

    hook (filter): Returns true if the current request should return valid AMP content.

    Source: vendor/automattic/jetpack-lazy-images/src/lazy-images.php:85

    wpcom_instagram_widget_target

    hook (filter): Filter how Instagram image links open in the Instagram widget.

    Source: modules/widgets/class-jetpack-instagram-widget.php:322

    wpcom_instagram_widget_max_columns

    hook (filter): Allow changing the maximum number of columns available for the Instagram widget.

    Source: modules/widgets/class-jetpack-instagram-widget.php:64

    jetpack_is_local_site

    hook (filter): Filters is_local_site check.

    Source: vendor/automattic/jetpack-status/src/class-status.php:153

    jetpack_offline_mode

    hook (filter): Filters Jetpack's offline mode.

    Source: vendor/automattic/jetpack-status/src/class-status.php:71