You can select multple agents on the agent monitor page and delete them. You could create a filter to list specific agents, say disconnected agents older than X days, select all and then delete them. However, if it's more than a few pages of return data the process will error out. Something Palo needs to correct.
I had a similar issue where I wanted to bulk delete agents in my UA environment. i had to open a support case and work with an engineer to build our a special SQL query to take care of this.
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