Connector for gathering of common system metrics

[ernadh]

Describe the problem you are trying to solve
Use Tremor as a system metrics collection agent, replacing Telegraf/Collectd/netdata/Nagios System Metrics plugin/etc as a source.

Describe the solution you'd like
Ability to configure an onramp dedicated to collect common system metrics.

Notes
Relying on a crate like heim would be a good starting point. Telegraf has many inputs that collect various system metrics though scattered in dozen+ plugins. It'd be good to have one that's highly configurable, similar to node_exporter in Prometheus land.

[Licenser]

Just throwing somethig in, that might belong in a different issue, but a bpf / (dtrace 😭) onramp might be very neat as an extension to system metrics.

[mfelsche]

This library might be a good tool for obtaining system metrics: https://github.com/heim-rs/heim