title: Prometheus - add target specific label in static_configs
body: <p>I have job definition as follows:</p>
  
  <pre><code>  - job_name: 'test-name'
      static_configs:
        - targets: [ '192.168.1.1:9100', '192.168.1.1:9101', '192.168.1.1:9102' ]
          labels:
            group: 'development'
  </code></pre>
  
  <p>Is there any way to annotate targets with labels? For instance, I would like to add 'service-1' label to '192.168.1.1:9100', 'service-2' to '192.168.1.1:9101' etc.</p>