update_option cron

add_action( 'update_option', function( $option, $old_value, $value ) {
	if ( 'cron' !== $option ) {
		return;
	}
	
	$json_old = wp_json_encode( $old_value );
	$json_new = wp_json_encode( $value );
	
	$old_contains = strpos( $json_old, 'boldgrid_backup_wp_cron_run_jobs' ) !== false;
	$new_contains = strpos( $json_new, 'boldgrid_backup_wp_cron_run_jobs' ) !== false;
	
	if ( $old_contains && ! $new_contains ) {
		$core   = apply_filters( 'boldgrid_backup_get_core', false );	
		$logger = new Boldgrid_Backup_Admin_Log( $core );

		$logger->init( 'update_option.log' );

		// We want to include the trace to see what is clearing the schedule.
		$e = new \Exception();
		$e = explode( "\n", $e->getTraceAsString() );

		$logger->add( print_r( array(
			'$e' => $e,
		), 1 ) );	
	}
}, 10, 3 );