[bug#40738] Prometheus (and Alertmanager)

[Christopher Baines]

I've had a go at packaging Prometheus and Alertmanager, as well as
writing Guix services for both of them.

The packages build, but still need quite a bit of work. They're both
written in Go, so the Git repositories not only include the relevant
source code, but the source code of the entire dependency tree (hence
the packages have no inputs). That'll need addressing.

I've tested the Prometheus service, and it seems to work, although there
isn't any record types for the Prometheus configuration yet. I haven't
yet tested the Alertmanager service and the system test doesn't pass, I
believe more configuration is required than Prometheus.

Having a Prometheus service would be a good complement for the existing
Prometheus Node exporter service in Guix.

I'll send the patches following this email.

Thanks,

Chris

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