To add to BPry's recommendation, if you know the servers that will see traffoc (You probably do) you can implement rules for them that allow any application and let it run 30-60 days. You can then use the migration tool to assign app-ids from he logs (I do not have the instructions handy, but they should be out there) - I've done this a number of times with great sucess Alternately, I've used Splunk to map the most common applications and endpoints from the logs, to begin building specific rules from that
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