anchor.diff:          password: ((pg_password))
   
   - name: worker
  -  instances: 2
  -  vm_type: g1-small
  +  instances: 3
  +  vm_type: f1-micro
     vm_extensions:
     - 50GB_ephemeral_disk
     stemcell: trusty
  
positive.code: 
  update:
    canaries: 1
    max_in_flight: 1
    serial: false
    canary_watch_time: 1000-60000
    update_watch_time: 1000-60000
  
negative.code: 
  - name: worker-windows
    instances: 1
    vm_type: f1-micro
    vm_extensions:
    - 50GB_ephemeral_disk
    stemcell: windows
  