And where do you think the golden images come from? The steps must be reproducible, versioned, audited, scripted and in the third hands of outsourced minions with 8 or 12h time lapse.
The golden rule of CICD does it survive if you’re visited by truck-kun?
Prometheus + node/container exporters. + Grafana for dashboards I haven’t touched zabbix in years but last time it didn’t support very well dynamic scalations. Also all of them are focused on monitoring infrastructure, you need to pay if you want APM or UX.
Enterprise level, for APM I like datadog, much better than NR. For UX we use acoustic tealeef.