Need help how to check for missing skills for a agent from URS logs

Please provide inputs or any document which will help in troubleshooting the issue.

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None…you need to understand concepts like how CfgServer and URS interacts.
Read logs and understand the why of each result on your URS logs

in your strategy put in a TARGET SKILL PRINT STATEMENT* at the skill targeting block to make it easier to see and find this in your URS logs to see what is being targeted.