Send logs to stderr, rather than stdout #1524
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We were sending the logs to stdout, rather that what seems to be the industry practice of stderr.
https://github.com/rs/zerolog#pretty-logging (our log library seems to prefer stderr)
https://www.reddit.com/r/golang/comments/jqvaft/why_does_the_log_package_always_output_to_stderr/ (go standard log sends to stderr)
But you can find other opinions, of course https://12factor.net/logs
Fixes #1519