In the mail.thread model `_track`propety is defined.
It as the following doc `
# Automatic logging system if mail installed
# _track = {
# 'field': {
# 'module.subtype_xml': lambda self, cr, uid, obj, context=None: obj[state] == done,
# 'module.subtype_xml2': lambda self, cr, uid, obj, context=None: obj[state] != done,
# },
# 'field2': {
# ...
# },
# }
`
But his puprose and usage is not really clear.
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