Query by JetPack Related Posts

jetpack.php

<?php
/**
 * Prevents Related Posts from displaying in content area
 */
function prefix_remove_rp() {
    if ( class_exists( 'Jetpack_RelatedPosts' ) ) {
        $jprp = Jetpack_RelatedPosts::init();
        $callback = array( $jprp, 'filter_add_target_to_dom' );
        remove_filter( 'the_content', $callback, 40 );
    }
}
add_filter( 'wp', 'prefix_remove_rp', 20 );

related.php

<?php
$related_posts = array();
$query = array();

// Number of posts to show
$query['showposts'] = 3;

// Fetches related post IDs if JetPack Related Posts is active
if ( class_exists( 'Jetpack_RelatedPosts' ) && method_exists( 'Jetpack_RelatedPosts', 'init_raw' ) ) :
	$related = Jetpack_RelatedPosts::init_raw()
		->set_query_name( 'theme-custom' ) // optional, name can be anything
		->get_for_post_id( get_the_ID(), array( 'size' => $query['showposts'] )
	);
	if ( $related ) :
        foreach ( $related as $result ) :
        	$related_posts[] = $result[ 'id' ];
        endforeach;
    endif;
endif;

// Sets query to related posts, falls back to recent posts
if ( $related_posts ) {
	$query['post__in'] = $related_posts;
	$query['orderby'] = 'post__in';
	$title = __( 'Related Posts', 'prefix' );
} else {
	$query['post__not_in'] = array( $post->ID );
	$title = __( 'Recent Posts', 'prefix' );
}
?>
<div class="related-posts">
	<h3><?php esc_attr_e( $title ); ?></h3>
	<?php $related = new WP_Query( $query ); ?>
	<?php while ( $related->have_posts() ) : $related->the_post(); ?>
		<div class="related-post clearfix">
			<div class="related-image">
				<a href="<?php the_permalink();?>"><?php the_post_thumbnail( 'archive' ); ?></a>
			</div>
			<div class="related-content">
				<h3><a href="<?php the_permalink();?>"><?php the_title( ); ?></a></h3>
				<p>by <a href="<?php echo get_author_posts_url( get_the_author_meta( 'ID' ), get_the_author_meta( 'user_nicename' ) ); ?>"><?php the_author(); ?></a></p>
			</div>
		</div>
	<?php endwhile; wp_reset_query(); ?>
</div>