I received at least 10 instances of these errors in one day yesterday, out of around ~50 emails that were sent through the day. In the last few months that my app has been executing, I have never seen this. Searching on Google revealed that the best cure is to send emails in the context of a task-queue request instead of a user facing request. That makes sense. However, yesterday was also the day I rolled out instance-hour-saving optimizations, and reduced my max_idle_instances to 1, while setting min_pending_latency to 200ms. This scheduler parameter change has not had any effect on overall performance of my app, in terms of average latencies, etc. I'm wondering if it is just a coincidence that my mail.send() call timedout, or was it somehow related to my scheduler parameter changes. Any thoughts?
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