Automatically flush for Log Event > 256KB

[jchangxu]

According to https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Embedded_Metric_Format_Specification.html
The embedded metric format is subject to the same limits as standard CloudWatch Logs events and are limited to a maximum size of 256 KB.

It would be really nice to have an auto flush feature when we detect the serialized log event is near 256KB.

[jaredcnance]

This one is interesting because we don’t know the size until we serialize it. We could maintain a character counter on insertion, but it may not be very accurate and will have lots of edge cases. Need to think about this one a bit. It might be easier to provide a configurable “flush after” metric count.