Feature request: transforms block in example config

[endlessuniverse]

Please include a transforms block in the example config to parse Heroku's log-runtime-metrics output so we can learn VRL through example.

More info: https://devcenter.heroku.com/articles/log-runtime-metrics
"This Heroku Labs log-runtime-metrics feature adds experimental support for enabling visibility into load and memory usage for running dynos. Per-dyno stats on memory use, swap use, and load average are inserted into the app’s log stream where they can be seen via heroku logs --tail, used for graphs or alerting via an add-on which consumes app logs, or sent to a log drain."

heroku[web.1]: source=web.1 dyno=heroku... sample#load_avg_1m=0.00
heroku[web.1]: source=web.1 dyno=heroku... sample#memory_total=7.61MB sample#memory_rss=3.05MB sample#memory_cache=4.55MB sample#memory_swap=0.00MB sample#memory_pgpgin=8665pages sample#memory_pgpgout=6717pages sample#memory_quota=512.00MB

Thanks a million!