pause.yaml

# This cleaner:
# - runs at 8PM every day
# - finds all Deployments/StatefulSet/DaemonSet with
# annotation "pause-resume"
#
# For any such resource: 
# - store current replicas in the annotation "previous-replicas"
# - set their replicas to zero (scale down and pause)
#
apiVersion: apps.projectsveltos.io/v1alpha1
kind: Cleaner
metadata:
  name: scale-down-deployment-statefulset-daemonset
spec:
  schedule: "* 20 * * *"
  action: Transform
  transform: |
    -- Set replicas to 0
    function transform()
      hs = {}

      if obj.metadata.annotations == nil then
        obj.metadata.annotations = {}
      end
      -- store in the annotation current replicas value
      obj.metadata.annotations["previous-replicas"] = tostring(obj.spec.replicas)
      
      -- reset replicas to 0
      obj.spec.replicas = 0
      
      hs.resource = obj
      return hs
    end  
  resourcePolicySet:
    resourceSelectors:
    - kind: Deployment
      group: apps
      version: v1
    - kind: StatefulSet
      group: "apps"
      version: v1
    - kind: DaemonSet
      group: "apps"
      version: v1
    aggregatedSelection: |
      function evaluate()
        local hs = {}

        -- returns true if object has annotaiton "pause-resume" 
        function hasPauseAnnotation(obj)
          if obj.metadata.annotations ~= nil then
            if obj.metadata.annotations["pause-resume"] then
              return true
            end

            return false
          end

          return
        end

        local resourceToPause = {}

        for _, resource in ipairs(resources) do
          if hasPauseAnnotation(resource) then
            table.insert(resourceToPause, {resource = resource})
          end
        end

        if #resourceToPause > 0 then
          hs.resources = resourceToPause
        end
        return hs
      end