Thanks again for the help Nick. Yes, we are looking into reducing the stack traces. Again, this warning should not happen suddenly after so many years in operation. On a related noted, this and a few other errors (e.g. 104 errors) that came in a wave at the same time (possibly after the recent GAE update) feels like some dials on the GAE side was tweaked that affected various constraints applied on apps. For example, errors we we were previously able to handle by catching the DeadlineExceededError suddenly started giving 104 errors. As I've not seen too many reports of similar problems from other app devs, this situation is probably affecting only those apps that handle high-latency datastore-heavy requests (like our app).
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