gce_sd has full url in zone meta data

[mkm85]

What did you do?
I created a gce sd config like

scrape_configs:
  - job_name: 'nodes'
    gce_sd_configs:
      - project: 'project'
        port: 9100
        zone: 'asia-southeast1-a'
    relabel_configs:
      - source_labels: ['__meta_gce_zone']
        target_label: region
        regex: '(.*)-[a-z]'

and started prometheus, then I can see that the __meta_gce_zone contains much more than just the zone, it contains an url which ends with the zone"

This is also a problem for '__meta_gce_network' and '__meta_gce_subnetwork'

What did you expect to see?

Labels: region="asia-southeast1"

What did you see instead? Under which circumstances?
Labels: region="https://www.googleapis.com/compute/v1/projects/project/zones/asia-southeast1"

Environment

Version	1.7.1
Revision	3afb3fffa3a29c3de865e1172fb740442e9d0133
Branch	master
BuildUser	root@0aa1b7fc430d
BuildDate	20170612-11:44:05
GoVersion	go1.8.3

Running on google compute engine (GCE) in a docker container. It's the official 1.7.1 docker image

• System information:
  Linux 4.10.0-30-generic x86_64

[mkm85]

The zone is taken from the go compute api https://godoc.org/google.golang.org/api/compute/v1#Instance
The documentation for that call states:

 // Zone: [Output Only] URL of the zone where the instance resides.

So that's where url's are coming from.

[brian-brazil]

We generally just take whatever the SD API gives us, you could extract out a shorter version using relabelling.

[mkm85]

Is it possible to update the documentation with example output? It was not expected that it would be an url, but being an url is fine if it's expected

I'm using the following relabelling rule now:

      - source_labels: ['__meta_gce_zone']
        target_label: region
        regex: '.*/([0-9a-zA-Z-]*)-[a-z]'

[brian-brazil]

Sure, I'd be happy to take a PR clarifying the docs.

[lock]

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