Split logged instance metrics into multiple lines when necessary #3690
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Heroku has a limit for log lines of 10,000 bytes, and when a line reaches that size the platform will automatically split it into multiple lines, breaking the tooling reading it.
To avoid that problem when outputting metrics, this commit implements the splitting on the application side when a line is longer than 5,000 bytes. The threshold is just 5,000 because the newline is inserted after the item that made the line too long, so it's possible that the actual lines will be longer than 5,000 bytes.
Fixes #3689.