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Initial work on Prometheus metrics

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This commit adds some Prometheus metrics to /metrics in headscale.

It will add the standard go metrics, some automatic gin metrics and some
initial headscale specific ones.

Some of them has been added to aid debugging #97 (loop bug)

In the future, we can use the metrics to get rid of the sleep in the
integration tests by checking that our expected number of nodes has been
registered:

```
headscale_machine_registrations_total
```
This commit is contained in:
Kristoffer Dalby 2021-10-04 16:28:07 +00:00
parent d3ef39a58f
commit 1d5b090579
8 changed files with 100 additions and 1 deletions
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2
go.mod
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@ -20,6 +20,7 @@ require (
github.com/moby/term v0.0.0-20210619224110-3f7ff695adc6 // indirect
github.com/opencontainers/runc v1.0.2 // indirect
github.com/ory/dockertest/v3 v3.7.0
github.com/prometheus/client_golang v1.11.0 // indirect
github.com/pterm/pterm v0.12.30
github.com/rs/zerolog v1.25.0
github.com/spf13/cobra v1.2.1
@ -28,6 +29,7 @@ require (
github.com/tailscale/hujson v0.0.0-20210818175511-7360507a6e88
github.com/tcnksm/go-latest v0.0.0-20170313132115-e3007ae9052e
github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
github.com/zsais/go-gin-prometheus v0.1.0 // indirect
golang.org/x/crypto v0.0.0-20210817164053-32db794688a5
golang.org/x/net v0.0.0-20210913180222-943fd674d43e // indirect
golang.org/x/sys v0.0.0-20210910150752-751e447fb3d0 // indirect