Hi Richard,
Thanks for bringing this up. This is something that we've talked about doing. What's really great about this idea is that if we do the work for this, we could also have an "experimental" cluster that doesn't provide an SLA or serving guarantees but provides new features - this would effectively replace the majority of our trusted tester program.
There is a lot of work going into stability this year, and I'm trying to round up some of the recent issues to see if there's something we missed.
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Ikai Lan
Developer Programs Engineer, Google App Engine