groups_delete_groupmeta( int $group_id, string|bool $meta_key = false, string|bool $meta_value = false, bool $delete_all = false )

function groups_delete_groupmeta( $group_id, $meta_key = false, $meta_value = false, $delete_all = false ) {
	global $wpdb;

	// Legacy - if no meta_key is passed, delete all for the item.
	if ( empty( $meta_key ) ) {
		$keys = $wpdb->get_col( $wpdb->prepare( "SELECT meta_key FROM {$wpdb->groupmeta} WHERE group_id = %d", $group_id ) );

		// With no meta_key, ignore $delete_all.
		$delete_all = false;
	} else {
		$keys = array( $meta_key );
	}

	add_filter( 'query', 'bp_filter_metaid_column_name' );

	$retval = true;
	foreach ( $keys as $key ) {
		$retval = delete_metadata( 'group', $group_id, $key, $meta_value, $delete_all );
	}

	remove_filter( 'query', 'bp_filter_metaid_column_name' );

	return $retval;
}