Kindly any inputs on this.
Thanks & Regards,
It might or might not be possible to track the errors. It depends on whether those errors result in the tracking beacon failing to be sent at all. If the tracking beacon can't be sent, then tracking the error in an eVar would be useless since it would never reach AA.
Since you're able to see that these errors are occurring, you should go into the relevant Custom Code in your Launch rules and fix them. And while you're there, make sure you test for as many scenarios as possible. Also, use JSLint as a first-check to validate your code.
What you should do is set up proper release process:
Also you mentioned "where they haven't used try catch method also.", when writing custom code you should never forget the try/catch and the catch should not be silent otherwise you will never know it fails:
use something meaningful in error like: `_satellite.logger.error('Failed in rule X in function X to set bla', e)`
Finally have a look at these for tagging, coding and release standards: