In the Cloud-Native world, [https://prometheus.io/ Prometheus] is an active project. It's a time-series database and metrics monitoring solution, [https://prometheus.io/docs/instrumenting/exporters/ with many exporters] including haproxy, memcached, mysqld, etc..
{{Video|url=https://www.youtube.com/watch?v=uV_sh7_lVw8}} [https://www.slideshare.net/brianbrazil/prometheus-from-berlin-to-bonanza-cloudnativeconkubecon-europe-2017 slides for the Video]
Prometheus is able to alert on any metric, so long as the data is available. This data comes from your [[wp:Instrumentation (computer programming)|code Instrumentation]]. See their docs for information on Instrumenting your code. https://prometheus.io/docs/practices/instrumentation/
And for a great dashboard, there is [[Netdata]]
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