This filter is already documented in core/wp-includes/comment-functions.php
comment_cookie_lifetime
comment_cookie_lifetime-
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filter jetpack_comment_subscription_formFilter the output of the subscription options appearing below the comment form.
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filter jetpack_subscribe_blog_labelFilter the Subscribe to blog text appearing below the comment form.
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filter jetpack_subscribe_comment_labelFilter the Subscribe to comments text appearing below the comment form.
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action jetpack_subscriptions_form_submissionFires on each subscription form submission.
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filter jetpack_subscriptions_exclude_all_categories_exceptONLY send subscription emails for these categories Will ONLY send subscription emails to these categories.
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filter jetpack_subscriptions_exclude_these_categoriesArray of categories that will never trigger subscription emails. Will not send subscription emails from any post from within these categories.
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filter jetpack_is_post_mailableFilter whether posts can be emailed to subscribers.
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filter jetpack_allow_per_post_subscriptionsFilter whether or not to show the per-post subscription option.
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filter infinite_scroll_creditFilter Infinite Scroll’s credit text.
Jetpack Developer Resources 