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``level``: Specifies the level of detail the log has.
Learn more: :ref:`log_level <cfg_logging-log_level>`.
``log``: Specifies where to send the log's output, for example, to a file, pipe, or system logger.
Learn more: :ref:`log <cfg_logging-log>`.
``nonblock``: If **true**, Tarantool does not block during logging when the system is not ready for writing, and drops the message instead.
Learn more: :ref:`log_nonblock <cfg_logging-log_nonblock>`.
``format``: Specifies the log format: 'plain' or 'json'.
Learn more: :ref:`log_format <cfg_logging-log_format>`.
``modules``: Configures the specified log levels for different modules.
Learn more: :ref:`log_modules <cfg_logging-log_modules>`.
The example below shows how to set the log level to 'debug' and how to send the resulting log to the 'tarantool.log' file:
log = require('log')
log.cfg{ level='debug', log='tarantool.log'}
Note that calling ``log.cfg()`` before ``box.cfg()`` takes into account logging options specified using :ref:`environment variables <box-cfg-params-env>`, such as ``TT_LOG`` and ``TT_LOG_LEVEL``.
Log a message with the specified logging level. You can learn more about the available levels from the :ref:`log_level <cfg_logging-log_level>` property description.
The example below shows how to log a message with the ``info`` level:
log = require('log')

-- Prints 'warn' messages --
log.warn('Warning message')
--[[
2023-07-20 11:03:57.029 [16300] main/103/interactive/tarantool [C]:-1 W> Warning message
---
...
--]]
Parameters
A log message. * A message can be a string. * A message may contain C-style format specifiers ``%d`` or ``%s``. Example: .. code-block:: lua box.cfg{} log = require('log') log.info('Info %s', box.info.version) * A message may be a scalar data type or a table. Example: .. code-block:: lua log = require('log') log.error({500,'Internal error'})
A log message.
A message can be a string.
A message may contain C-style format specifiers ``%d`` or ``%s``. Example:
box.cfg{}
log = require('log')
log.info('Info %s', box.info.version)
A message may be a scalar data type or a table. Example:
log = require('log')
log.error({500,'Internal error'})
return
nil
The actual output will be a line in the log, containing:
the current timestamp
a module name
'E', 'W', 'I', 'V' or 'D' depending on the called function
``message``

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testing_project / Documentation: reference/reference_lua/log — English

log = require('log')

-- Prints 'warn' messages --
log.warn('Warning message')
--[[
2023-07-20 11:03:57.029 [16300] main/103/interactive/tarantool [C]:-1 W> Warning message
---
...
--]]
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