bp_groups_format_activity_action_activity_update( string $action, object $activity )

function bp_groups_format_activity_action_activity_update( $action, $activity ) {
	$user_link = bp_core_get_userlink( $activity->user_id );

	$group      = groups_get_group( $activity->item_id );
	$group_link = '<a href="' . esc_url( bp_get_group_permalink( $group ) ) . '">' . esc_html( $group->name ) . '</a>';

	$action = sprintf( __( '%1$s posted an update in the group %2$s', 'buddyboss' ), $user_link, $group_link );

	/**
	 * Filters the groups 'activity_update' activity actions.
	 *
	 * @since BuddyBoss 1.1.9
	 *
	 * @param string $action   The groups 'activity_update' activity actions.
	 * @param object $activity Activity data object.
	 */
	return apply_filters( 'bp_groups_format_activity_action_activity_update', $action, $activity );
}