[google-cloud-sql-discuss] Sql Logs filled with Logon Login failed for user 'a-...-\a-...-$'.

My Sql Server logs (Cloud Sql, of course) are full with the following:

Logon Login failed for user 'a-xxxxxxxxxxxx-\a-xxxxxxxxxxxx-$'. Reason: Token-based server access validation failed with an infrastructure error. Login lacks connect endpoint permission

(I redacted the account, just in case its sensitive).

These are coming through about every 20 minutes 24/7, I have no idea what that account is. 

My best guess it its some sort of service to check on the server periodically, but no clue. My app engine app and sql proxy connections are working just fine.

Any ideas?

Thanks

Travis

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