Using systemd journal handler, logs ending up in kern.log becauseSYSLOG_FACILITY is missing. This fix uses the same facility configurationoption ‘syslog-log-facility’ as from syslog handler to provide themissing value. (Bug #1871840)

Python 2.7 is no longer supported. The minimum supported version of Pythonis now Python 3.6.

The following new config options will allow rotating log files,especially useful on Windows:*log_rotate_interval*log_rotate_interval_type*max_logfile_count*max_logfile_size_mb*log_rotation_type

Added Windows EventLog functionality to oslo.log. Set use_eventlog to truein the service’s configuration file to use it.

The JSONFormatter formatter now converts unserializable objects withrepr() to prevent JSON serialization errors on logging. The fix requiresoslo.serialization 2.21.1 or newer. (Bug #1593641)

The JSON based formatters (namely JSONFormatter and FluentFormatter) nowoutput an extra section called ‘context’ that contains the context-relatedkeys and values, e.g. user, project and domain.

The use_json configuration option was added. It enables JSON formatting inthe logs when set to True. The option is also available through the commandline via the--use-json flag.

If the log format string includes%(error_summary)s, it willbe replaced with a summary of the current error when there is oneand with “-” when there is no error. If the log format stringdoes not include%(error_summary)s the error summary will beappended to the end of the line automatically, only if there is anerror.

Systemd native journal support is added. You can enable this inservices with theuse_journal flag.

A newoslo_log.log.is_debug_enabled helper function is added thatallows to determine whether debug mode is enabled for logging.

Configuration optionuse_stderr’s default value is False now, this will avoid same logs on service log and specific log file by option –log-file.

The log_config_append configuration option is now mutable and the logging settings it controls are reconfigured when the configuration file is reread. This can be used to, for example, change logger or handler levels.

The deprecated ‘verbose’ option has been removed.

When removing the “verbose” option, the default logging level was set to “WARNING” by mistake. Fixed it back to “INFO”.

The deprecated use_syslog_rfc_format configuration option has been removed.

The deprecated log_format configuration option has been removed.

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