How do you determine different message levels in logging systems?

In logging systems, messages are classified by importance levels to filter and manage log output. The main levels are:

• DEBUG — detailed information for debugging.
• INFO — general information about the application's operation.
• WARNING — warnings about potential issues.
• ERROR — errors that do not cause the program to stop.
• CRITICAL — critical errors requiring immediate attention.

In Python's logging module, levels are defined by constants, for example:

import logging

logging.basicConfig(level=logging.DEBUG)
logging.debug('Debug message')
logging.info('Informational message')
logging.warning('Warning')
logging.error('Error')
logging.critical('Critical error')

This separation helps to effectively monitor and analyze the application's operation.