This first section is an example logger.properties file when no changes have been made to logging.
If changes are made to logging the file will be re-written with the new values, but in doing so it will overwrite the file format, leaving only the values - see the second section. 

# Properties file which configures the operation of the JDK
# logging facility.

# The system will look for this config file, first using
# a System property specified at startup:
#
# >java -Djava.util.logging.config.file=myLoggingConfigFilePath
#
# If this property is not specified, then the config file is
# retrieved from its default location at:
#
# JDK_HOME/jre/lib/logging.properties

# Global logging properties.
# ------------------------------------------
# The set of handlers to be loaded upon startup.
# Comma-separated list of class names.
# (? LogManager docs say no comma here, but JDK example has comma.)
handlers=org.slf4j.bridge.SLF4JBridgeHandler

# Default global logging level.
# Loggers and Handlers may override this level
.level=INFO

# Loggers
# ------------------------------------------
# Loggers are usually attached to packages.
# Here, the level for each package is specified.
# The global level is used by default, so levels
# specified here simply act as an override.

# Handlers
# -----------------------------------------

# --- GITFileHandler ---
# Override of global logging level
com.wandisco.gitms.logging.GITFileHandler.level=ALL

# Naming style for the output file:
com.wandisco.gitms.logging.GITFileHandler.pattern=gitms.%g.log

# Limiting size of output file in bytes -defaulted to 1MB:
com.wandisco.gitms.logging.GITFileHandler.limit=1048576

# Number of output files to cycle through, by appending an
# integer to the base file name:
com.wandisco.gitms.logging.GITFileHandler.count=500

# Style of output (Simple or XML):
com.wandisco.gitms.logging.GITFileHandler.formatter=com.wandisco.gitms.logging.GITLogFormatter




If you change logging the new file will look more like this example:


Thu Apr 20 12:54:23 BST 2017
com.wandisco.gitms.logging.GITFileHandler.limit=1048576
com.wandisco.gitms.logging.GITFileHandler.pattern=gitms.%g.log
com.wandisco.gitms.logging.GITFileHandler.formatter=com.wandisco.gitms.logging.GITLogFormatter
handlers=org.slf4j.bridge.SLF4JBridgeHandler
com.wandisco.gitms.logging.GITFileHandler.count=500
.level=INFO
com.wandisco.gitms.logging.GITFileHandler.level=INFO