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If I were to design everything from scratch now, I'd look at setting up a Prometheus network. You can take a look at the Promcom Talk: Monitoring Cloudflare's Planet-Scale Edge Network with Prometheus
Since you're interestedin SaaS, this might be a good candidate for Grafana's cloud agent and service. The cloud agent is open source and based on the Prometheus code.
For example, for a lot of IDS work, you want to capture netflows if you can. This is something you could do with goflow. Then you can use whatever SIEM/flow analysis tools to figure out what is touching each network location.