Filter the output HTML of Related Posts.
jetpack_related_posts_display_markup
jetpack_related_posts_display_markup-
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filter jetpack_related_posts_customize_optionsThe filter allows you to change the options used to display Related Posts in the Customizer.
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filter jetpack_relatedposts_filter_allow_feature_toggleFilter the display of the Related Posts toggle in Settings > Reading.
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filter jetpack_relatedposts_filter_date_rangeFilter the date range used to search Related Posts.
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filter jetpack_relatedposts_filter_post_css_classesFilter the post css classes added on HTML markup.
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filter jetpack_relatedposts_filter_thumbnail_sizeFilter the size of the Related Posts images.
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filter jetpack_relatedposts_filter_hitsFilter the Related Posts matched by Elasticsearch.
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filter jetpack_relatedposts_post_category_contextFilter the “In Category” line displayed in the post context below each Related Post.
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filter jetpack_relatedposts_returned_resultsFilter the array of related posts matched by Elasticsearch.
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filter jetpack_relatedposts_post_tag_contextFilter the “In Tag” line displayed in the post context below each Related Post.
Jetpack Developer Resources 