The Prometheus monitoring system and time series database.
As for metrics collection, Prometheus is what I would recommend. It scales far better than pretty much everything else out there. It's open source. It can monitor anything, not just networking devices. It's built-in to a lot of modern software and some vendors support it directly.
Prometheus style smokeping
I wrote a "better smokeping" tool that produces much more detailed data than IP SLA.
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Robotmk - the Robot Framework integration for Checkmk
We are using checkmk to monitor 1000s of locations in terms of reachability and performance. Basically you use the checkmk (www.checkmk.com) server as a central site that pings your network devices and your servers (both is important since a slow server doesn't mean "the network is so slow(tm)" ) In Checkmk you get nice graphs but you can also export your data to grafana (which is what we do) to build a smokeping like expirience. Smokeping is a nice tool, but it's rather old and does not scale too well. Checks from your network devices can be implemented using ipsla (cisco?). Theres a plugin for that: https://checkmk.com/de/integrations/cisco\_ip\_sla. If you want to monitor stuff from a (near) user perspective: Check MK supports a distributed setup that allows you to place sensors in differenent locations (if you don't want to implement the full end-to-end monitoring using something like Robot-Framework (https://github.com/simonmeggle/robotmk). If you want deeper network visibility then you could pair checkmk with ntopng (https://www.ntop.org/products/traffic-analysis/ntop/). This way you'll get a lot more than plain RTT and network interface load like ipfix, dpi, *flow, etc...
Real-Time monitoring and alerting software
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Is there a simple console (ncurses?) application to show a simple green-light/red-light availability (ping?) of a user-defined list of nodes in a single-screen map/list/columns format?
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Integrating Software Networking products into Monitoring
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How do you accomplish RAID monitoring for your servers?
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Top 11 MYSQL monitoring tools in 2022 [open-source included]
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