Print `uname -a` as part of startup

[RichiH]

This would better fit into prometheus/common, but it seems every part of prometheus does this on its own.

To prevent questions about OS, architecture, etc, it would be nice if the output of uname -a, or the relevant subset, could just be printed along with build info during startup.

[CrazyByDefault]

Looks like this could be addded to either prometheus/cmd/prometheus/main.go or to common/version/info.go.

But the question of what to put is kinda tricky. Not all OSes are compatible with uname -a (especially Windows).

Also, I'm new to Golang (not to mention Open Source contrib in general), and I'd like to contribute to Prometheus.

[brian-brazil]

We wouldn't actually shell out to uname, any way you can get roughly the same information is fine and if it's missing/incomplete on some platforms that's okay. https://github.com/prometheus/node_exporter/blob/master/collector/uname_linux.go should get you started.

[lock]

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