Filter types of posts that will be counted in the widget
jetpack_widget_authors_post_types
jetpack_widget_authors_post_types-
action jetpack_published_postAction that gets synced when a post type gets published.
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filter jetpack_published_post_flagsFilter that is used to add to the post flags ( meta data ) when a post gets published
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filter jetpack_sync_do_not_expand_shortcodesFilter prevents some shortcodes from expanding. Since we can can expand some type of shortcode better on the .com side and make the expansion more relevant to contexts. For example [galleries] and subscription emails
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filter jetpack_sync_cron_start_time_offsetAllows overriding the offset that the sync cron jobs will first run. This can be useful when scheduling cron jobs across multiple sites in a network.
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action jetpack_custom_css_customizer_controlsAn action to grab on to if another Jetpack Module would like to add its own controls.
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action jetpack_sync_unlock_sync_callableUsed to signal that the callables await transient should be cleared. Clearing the await transient is useful in cases where we need to sync values to WordPress.com sooner than the default wait time.
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filter jetpack_nova_menu_item_loop_classFilter a menu Item Markup element’s class attribute.
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filter jetpack_nova_menu_item_loop_close_elementFilter a menu item’s element closing tag.
Jetpack Developer Resources 