I see Chris Siebenmann (https://utcc.utoronto.ca/~cks/space/blog/ https://utcc.utoronto.ca/~cks/space/blog/) blog about Prometheus (https://prometheus.io/ https

I see Chris Siebenmann (https://utcc.utoronto.ca/~cks/space/blog/ https://utcc.utoronto.ca/~cks/space/blog/) blog about Prometheus (https://prometheus.io/ https://prometheus.io/) often. It seems quite capable of this and a lot more complex alerts.