If the timestamper plugin is installed (or we can just depend on it), we could have CloudWatchRetriever either include a serialized TimestampNote at the start of every line in the raw log; or, more efficiently, call TimestampFormat.markup directly from OverallLog.writeHtmlTo. Thus we can get timestamps (elapsed or clock time) display in the Jenkins classic build console without actually increasing the size of the stored log, since the necessary information is already recorded in CloudWatch.

Ideally ConsoleNotes could also look for and omit TimestampNote in the raw log, in case the user is still using the timestamps wrapper.