Filter the default Twitter card image, used when no image can be found in a post.
jetpack_twitter_cards_image_default
jetpack_twitter_cards_image_default-
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action jetpack_post_meta_batch_deleteUsed for syncing deletion of batch post meta
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filter jetpack_sync_options_contentlessFilter the list of WordPress options that should be synced without content
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action jetpack_sync_action_before_enqueueAdd an action hook to execute when anything on the whitelist gets sent to the queue to sync.
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action jetpack_{$transient}_changeTrigger a change to a specific update that we want to sync. Triggers one of the following actions: – jetpack_{$transient}_change – jetpack_update_plugins_change – jetpack_update_themes_change
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filter lazyload_images_placeholder_imageAllows plugins and themes to modify the placeholder image.This filter is not prefixed with jetpack_ to provide a smoother migration process from the WordPress Lazy Load plugin.
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filter jetpack_lazy_images_new_attributesAllow plugins and themes to override the attributes on the image before the content is updated.One potential use of this filter is for themes that set height:auto on the img tag. With this filter, the theme could get the width and height attributes from the $attributes array and then add a style tag that sets those values as well, which could minimize reflow as images load.
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filter lazyload_is_enabledWhether the lazy-images module should load.This filter is not prefixed with jetpack_ to provide a smoother migration process from the WordPress Lazy Load plugin.
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filter jetpack_pwa_background_colorAllows overriding the PWA theme color which is used when loading the app.
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filter jetpack_pwa_manifestAllow overriding the manifest.
Jetpack Developer Resources 