This filter is documented in core/src/wp-includes/pluggable.php
wp_login_failed
wp_login_failed-
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filter jetpack_sso_require_two_stepIs it required to have 2-step authentication enabled on WordPress.com to use SSO?
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action jetpack_sso_pre_handle_loginFires before Jetpack’s SSO modifies the log in form.
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filter jetpack_remove_login_formRemove the default log in form, only leave the WordPress.com log in button.
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filter jetpack_sso_bypass_login_forward_wpcomRedirect the site’s log in form to WordPress.com’s log in form.
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filter jetpack_sso_display_disclaimerFilter the display of the disclaimer message appearing when default WordPress login form is disabled.
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filter jetpack_shortcodes_to_includeThis filter allows other plugins to override which shortcodes Jetpack loads. Fires as part of the `after_setup_theme` WP hook, so modifying code needs to be in a plugin, not in a theme’s functions.php.
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filter jetpack_pinit_over_buttonFilter the Pin it button appearing when hovering over images when using the official button style.
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filter jetpack_sharing_pinterest_widget_typeFilters the Pinterest widget type.
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filter jetpack_sharing_pinterest_share_urlFilters the Pinterest share URL used in sharing button output.
Jetpack Developer Resources 