I'm not a developer so feel free to tell me this won't work. I got the idea from a OpenTTD fork that did something similar and this mod looks like it's 95% of the way to what I want. https://github.com/grand-central-garbage/openttd-prometheus

I'd love it if these stats could be streamed to a CSV file (one line per interval with the city name and all the stats).

I'd then hoover up the stats with Telegraf send them off to Influx DB and make beautiful Grafana dashboards to display on my other screens while playing.