See also:
Jetpack_Options::get_option_names() jetpack_register (string)
Temporary verification secrets.
jetpack_activated (int)
1: the plugin was activated normally
2: the plugin was activated on this site because of a network-wide activation
3: the plugin was auto-installed
4: the plugin was manually disconnected (but is still installed)
jetpack_active_modules (array)
Array of active module slugs.
jetpack_do_activate (bool)
Flag for "activating" the plugin on sites where the activation hook never fired (auto-installs)