procedure todo_proc_name(p_param1_todo in varchar2)
  as
    l_my_important_var number := 1;
    l_my_important_var_logger constant varchar2(30) := 'l_my_important_var ';
    l_p_param1_todo_logger    constant varchar2(30) := 'p_param1_todo';

    l_scope constant logger_logs.scope%type := gc_scope_prefix || 'todo_proc_name';
    l_params logger.tab_param;

  begin
    logger.append_param(p_params => l_params, p_name =>  l_p_param1_todo_logger  , p_val => p_param1_todo);
    logger.log(constants.log_start, l_scope, null, l_params);
       ...

    l_my_important_var := 2;
    logger.append_param(p_params => l_params, p_name => l_my_important_var_logger , p_val => l_my_important_var );
    logger.log(constants.log_end, l_scope, null, l_params );
  end todo_proc_name;