anchor.diff:  
   update:
     canaries: 1
  -  max_in_flight: 1
  +  max_in_flight: 10
     serial: false
     canary_watch_time: 1000-60000
     update_watch_time: 1000-60000
  
positive.code:         password: ((pg_password))
  
  - name: worker
    instances: 2
    vm_type: g1-small
    vm_extensions:
    - 50GB_ephemeral_disk
    stemcell: trusty
  
negative.code: instance_groups:
  - name: web
    instances: 1
    vm_type: f1-micro
    vm_extensions:
    - lb
    stemcell: trusty
  