How to group all instances of this error message?

I'm currently getting an error like this:

Phantasm: Error sending to http://phantasm-test.spryfox.com/t?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: java.net.UnknownHostException: Unable to resolve host "phantasm-test.spryfox.com": No address associated with hostname; queueing for later

That long random-looking string changes pseudo-randomly, even within the same user. This means that the console quickly fills up with unmerged errors that are all the same issue.

Obviously I should fix the error, but what can I do about it filling up the errors list in the mean time? Is there a tweak I can make to the message to make it more likely to merge?

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