def add_file_handler(logger,level,tags):
f_formatter = logging.Formatter('<STR_LIT>')<EOL>filename = get_logfile_name(tags)<EOL>handler = logging.FileHandler(filename=filename,mode="<STR_LIT:a>")<EOL>handler.setLevel(level)<EOL>handler.setFormatter(f_formatter)<EOL>logger.addHandler(handler)<EOL>
Creates and Adds a file handler (`logging.FileHandler` instance) to the specified logger. 

    Args:
        logger: The `logging.Logger` instance to add the new file handler to.
        level: `str`. The logging level for which the handler accepts messages, i.e. `logging.INFO`.
        tags: `list` of tags to append to the log file name. Each tag will be '_' delimited. Each tag
             will be added in the same order as provided.