jetpack_api_include_comment_types_countInclude certain comment types in comment counts in the REST API. Note: the default array of comment types includes an empty string, to support comments posted before WP 5.5, that used an empty string as comment type.
jetpack_pre_switch_themeTrigger action before the switch theme happens.
jetpack_sharing_data_attributesFilter the sharing data attributes.
jetpack_get_available_standalone_modulesStand alone plugins need to use this filter to register the modules they interact with. This will allow them to activate and deactivate these modules even when Jetpack is not present. Note: Standalone plugins can only interact with modules that also exist in the Jetpack plugin, otherwise they’ll lose the ability to control it if Jetpack is activated.
jetpack_stats_footer_js_dataFilter the parameters added to the JavaScript stats tracking code.
jetpack_stats_footer_amp_dataFilter the parameters added to the AMP pixel tracking code.
jetpack_block_editor_pocket_casts_featureEnable Pocket Casts block variation in block editor context.
jetpack_sync_get_themes_callableFilters the output of Sync’s get_theme callable
jetpack_backup_initializedRuns right after the Jetpack Backup package is initialized.
jetpack_my_jetpack_should_enable_add_license_screenActs as a feature flag, returning a boolean for whether we should show the licensing UI.
Jetpack Developer Resources 