Expose gophercloud requests metrics

[sbueringer]

/kind feature

Describe the solution you'd like
A while back we contributed metrics about gophercloud requests to cloud-provider-openstack. I think it would be great to have the same metrics in CAPO

Anything else you would like to add:

Ref to the ccm PR: kubernetes/cloud-provider-openstack#1178
(this pr also adds reconcile metrics, I wouldn't do this for now, as controller-runtime already exposes those)

[sbueringer]

/help

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[jichenjc]

um... what do we want to expose? I knew
https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/metrics.md
and it expose OCCM data, what kind of metrics we want to expose for CAPO? the CAPO API calls?

[sbueringer]

@jichenjc I was mainly thinking about the 3 listed here: https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/metrics.md#openstack-api-calls

They have served us well when monitoring/alerting cloud-provider-openstack in prod.

[jichenjc]

ok, I can give a try as I did part of CPO metrics job
/assign

[sbueringer]

Okay :)

[tobiasgiese]

@jichenjc what is the current status here? Are you done with this issue or can I support you / take over?

[jichenjc]

part of the metrics added at #863

there are some todo (e.g GET/query part) , if you like ,you can work on it at your convenience :) @tobiasgiese

[tobiasgiese]

Okay, I'll take a look at it :)
/assign