Package index • logger

Key logging functions
`log_level()` `log_fatal()` `log_error()` `log_warn()` `log_success()` `log_info()` `log_debug()` `log_trace()`	Log a message with given log level
`OFF` `FATAL` `ERROR` `WARN` `SUCCESS` `INFO` `DEBUG` `TRACE`	Log levels
`log_threshold()`	Get or set log level threshold
Other logging helpers
`log_eval()`	Evaluate an expression and log results
`log_failure()`	Logs the error message to console before failing
`log_tictoc()`	Tic-toc logging
`log_elapsed()` `log_elapsed_start()`	Log cumulative running time
`log_separator()`	Logs a long line to stand out from the console
`log_with_separator()`	Logs a message in a very visible way
`with_log_threshold()`	Evaluate R expression with a temporarily updated log level threshold
`log_chunk_time()`	Automatically log execution time of knitr chunks
Appenders Log appenders define where logging output should be sent to.
`log_appender()`	Get or set log record appender function
`appender_async()`	Delays executing the actual appender function to the future in a background process to avoid blocking the main R session
`appender_console()` `appender_stderr()`	Append log record to stderr
`appender_file()`	Append log messages to a file
`appender_kinesis()`	Send log messages to a Amazon Kinesis stream
`appender_pushbullet()`	Send log messages to Pushbullet
`appender_slack()`	Send log messages to a Slack channel
`appender_stdout()`	Append log record to stdout
`appender_syslog()`	Send log messages to the POSIX system log
`appender_syslognet()`	Send log messages to a network syslog server
`appender_tee()`	Append log messages to a file and stdout as well
`appender_telegram()`	Send log messages to a Telegram chat
`appender_void()`	Dummy appender not delivering the log record to anywhere
Formatters Log formatters control how the inputs to the `log_` functions are converted to a string. The default is `formatter_glue()` when `glue` is installed.
`log_formatter()`	Get or set log message formatter
`formatter_cli()`	Apply `cli::cli_text()` to format string with cli syntax
`formatter_glue()`	Apply `glue::glue()` to convert R objects into a character vector
`formatter_glue_or_sprintf()`	Apply `glue::glue()` and `sprintf()`
`formatter_glue_safe()`	Apply `glue::glue_safe()` to convert R objects into a character vector
`formatter_json()`	Transforms all passed R objects into a JSON list
`formatter_logging()`	Mimic the default formatter used in the logging package
`formatter_pander()`	Formats R objects with pander
`formatter_paste()`	Concatenate R objects into a character vector via `paste`
`formatter_sprintf()`	Apply `sprintf()` to convert R objects into a character vector
`skip_formatter()`	Skip the formatter function
Layouts Logging layouts control what is sent to the appender. They always include the logged string, but might also include the timestamp, log level, etc.
`log_layout()`	Get or set log record layout
`layout_blank()`	Format a log record by including the raw message without anything added or modified
`layout_gha()`	Format a log record for github actions
`layout_glue()`	Format a log message with `glue::glue()`
`layout_glue_colors()`	Format a log message with `glue::glue()` and ANSI escape codes to add colors
`layout_glue_generator()`	Generate log layout function using common variables available via glue syntax
`layout_json()`	Generate log layout function rendering JSON
`layout_json_parser()`	Generate log layout function rendering JSON after merging meta fields with parsed list from JSON message
`layout_logging()`	Format a log record as the logging package does by default
`layout_simple()`	Format a log record by concatenating the log level, timestamp and message
`layout_syslognet()`	Format a log record for syslognet
Hooks for automated logging
`log_shiny_input_changes()`	Auto logging input changes in Shiny app
`log_messages()`	Injects a logger call to standard messages
`log_warnings()`	Injects a logger call to standard warnings
`log_errors()`	Injects a logger call to standard errors
Other helpers
`colorize_by_log_level()` `grayscale_by_log_level()`	Color string by the related log level
`logger()`	Generate logging utility
`delete_logger_index()`	Delete an index from a logger namespace
`%except%`	Try to evaluate an expressions and evaluate another expression on exception
Dev tools
`as.loglevel()`	Convert R object into a logger log-level
`deparse_to_one_line()`	Deparse and join all lines into a single line
`fail_on_missing_package()`	Check if R package can be loaded and fails loudly otherwise
`get_logger_meta_variables()`	Collect useful information about the logging environment to be used in log messages
`log_namespaces()`	Looks up logger namespaces
`log_indices()`	Returns number of currently active indices

Reference

Key logging functions

Other logging helpers

Appenders

Formatters

Layouts

Hooks for automated logging

Other helpers

Dev tools