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We monitor ~3500 servers and network devices. Web: https://checkmk.com/
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snmpcollector
A full featured Generic SNMP data collector with Web Administration Interface for InfluxDB
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.
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Scout APM
Less time debugging, more time building. Scout APM allows you to find and fix performance issues with no hassle. Now with error monitoring and external services monitoring, Scout is a developer's best friend when it comes to application development.
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Specifically for JunOS, I wrote a special config that limits the number of metrics and breaks things up to avoid slowness.
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I also recommend reading this discussion thread for JunOS.
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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.