anchor.diff:  purposes. The scheduler will try to balance the service pods across all
   applicable nodes as evenly as possible.
   
  +[[scheduler-sample-policies]]
   == Sample Policy Configurations
   The configuration below specifies the default scheduler configuration, if it
   were to be specified via the scheduler policy file.
   ----
   kind: "Policy"
   version: "v1"
  -predicates: 
  +predicates:
     - name: "PodFitsPorts"
     - name: "PodFitsResources"
     - name: "NoDiskConflict"
     - name: "MatchNodeSelector"
     - name: "HostName"
  -priorities: 
  +priorities:
     - name: "LeastRequestedPriority"
       weight: 1
     - name: "BalancedResourceAllocation"
  
positive.code: ...
    - name: "ZoneSpread"
      weight: 2
      argument: 
        serviceAntiAffinity: 
          label: "zone"
    - name: "ZonePreferred"
      weight: 1
      argument: 
        labelPreference: 
          label: "zone"
          presence: true
    - name: "ServiceSpreadingPriority"
  
negative.code: policy. If any of the default predicates and priority functions are required,
  they have to be explicitly specified in the scheduler configuration file.
  
  [[default-scheduler-policy]]
  === Default Scheduler Policy
  The default scheduler policy includes the following predicates:
  
  