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snmpcollector
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We monitor ~3500 servers and network devices. Web: https://checkmk.com/
At least a demo can be done with snmpcollector + influxdb (+ Grafana?). I think it allows faster polling, however if I recall, the polling interval is always configured in the measurement template itself.
Specifically for JunOS, I wrote a special config that limits the number of metrics and breaks things up to avoid slowness.
I also recommend reading this discussion thread for JunOS.
Oh, shameless plug for my smokeping prober tool. You can run continuous 1s pings and it will produce stats. Useful for end-to-end tests of network paths. IMO it's better than the original smokeping, because it sends a stream of pings, rather than bursts.