Don's reply to my question on chromeos-infra-discuss:

"I don't think SoM currently covers any builders other than the master/slave groups used for CQ/Release/PFQs.

Today, it works by looking for hard coded master builders, then searching for related slave builds. Adding additional 'masters' isn't hard, but keeping them up to date will be error prone.

I hope we can come up with the right way to have it search for all builders without configuration. I have some ideas, but they aren't ready yet."

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These are still very important builders and should probably be watched by the Sheriffs.