Get or set log message formatter
log_formatter(formatter = NULL, namespace = "global", index = 1)function defining how R objects are converted into
a single string, eg formatter_paste(), formatter_sprintf(),
formatter_glue(), formatter_glue_or_sprintf(),
formatter_logging(), default NULL
logger namespace
index of the logger within the namespace
Other log configutation functions:
log_appender(),
log_layout(),
log_threshold()