Filter the contact form submit button class attribute.
jetpack_contact_form_submit_button_class
jetpack_contact_form_submit_button_class-
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filter grunion_contact_form_delete_feedback_postFilters whether to erase a particular Feedback post.
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filter jetpack_should_use_minified_assetsFilters the switch that if set to true allows Jetpack to use minified assets. Defaults to true if the SCRIPT_DEBUG constant is not set or set to false. The filter overrides it.
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filter jetpack_postimages_ignore_minimum_dimensionsFilters the switch to ignore minimum image size requirements. Can be used to add custom logic to image dimensions, like only enforcing one of the dimensions, or disabling it entirely.
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action jetpack_updated_themesSignals to the sync listener that one or more themes was updated and a sync action reflecting the update and the theme info should be sent
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filter jetpack_site_pending_automated_transferFilter if a site is in pending automated transfer state.
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filter jetpack_site_automated_transferFilter if a site is an automated-transfer site.
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filter jetpack_show_backupsWhether UI for backups should be displayed.
Jetpack Developer Resources 