Bases: logging.Formatter
A context.RequestContext aware formatter configured through flags.
The flags used to set format strings are: logging_context_format_string and logging_default_format_string. You can also specify logging_debug_format_suffix to append extra formatting if the log level is debug.
For information about what variables are available for the formatter see: http://docs.python.org/library/logging.html#formatter
If available, uses the context value stored in TLS - local.store.context
Uses contextstring if request_id is set, otherwise default.
Format exception output with CONF.logging_exception_prefix.