The CloudWatch "keep warm" events are just one invocation, yes.
I do not remember having had issues with it, but honestly, I don't think I actually have stats on that anymore.
I've just checked in S3, but it doesn't look like we have request or data transfer metrics enabled on the model bucket. I may enable those next week to monitor the effectiveness of our strategy better.
I imagine if the code were properly written to deal with race conditions you wouldn’t notice any issues either way besides an increased latency for some requests.
I do not remember having had issues with it, but honestly, I don't think I actually have stats on that anymore.
I've just checked in S3, but it doesn't look like we have request or data transfer metrics enabled on the model bucket. I may enable those next week to monitor the effectiveness of our strategy better.