Allow CSS to be concatenated into a single jetpack.css file.
jetpack_implode_frontend_css
jetpack_implode_frontend_css-
filter -
action update_option_{$identity_option}Fires when a shadow site option is updated.These options are updated via the Identity Crisis UI. $identity_option is the option that gets updated.
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filter jetpack_has_identity_crisisFilters the errors returned when checking for an Identity Crisis.
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filter jetpack_identity_crisis_options_to_checkFilter the options that we should compare to determine an identity crisis.
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filter jetpack_content_widthFilter the Content Width value.
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action jetpack_site_registeredFires when a site is registered on WordPress.com.
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action jetpack_module_configuration_screen_{$module_id}Fires when a feature configuation screen is loaded.The dynamic part of the hook, $module_id, is the module ID.
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action jetpack_notices_update_settingsFires within the displayed message when a feature configuation is updated.
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filter jetpack_stats_base_urlFilter the URL used as the Stats tracking pixel.
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action jetpack_module_configuration_load_{$_GET['configure']}Fires when a module configuration page is loaded.The dynamic part of the hook is the configure parameter from the URL.
Jetpack Developer Resources 