I would not think Solarwinds could poll that file unless you attempt to use Orion APM in some way to read the contents and manipulate it in a way to generate a syslog event .etc. then build a trending report with Report Writer. It would require some work to do this.
Have you looked into using Cisco's EEM - Embedded Event Manager - it will depend on the IOS release and some more stuff but it might be worth looking at for this case. If you're already scripting then this might fall into place for you. Good Luck!