Python standard logging Filter class to add Cloud Logging
information to each LogRecord.
When attached to a LogHandler, each incoming log will be modified
to include new Cloud Logging relevant data. This data can be manually
overwritten using the extras argument when writing logs.
Initialize with the name of the logger which, together with its
children, will have its events allowed through the filter. If no
name is specified, allow every event.
filter
filter(record)
Add new Cloud Logging data to each LogRecord as it comes in