ScaledObject Cron Trigger 'end' expression is not working as expected.

[pazuzux]

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Hello everyone!
I needed to use the cron trigger to schedule a scale by time in a deployment and the end expression doesn't act as expected.

I'm setting start and end to run within 10 minutes, but only start is taken into account.

I needed to do the configuration below to solve the scale down:
cooldownPeriod and stabilizationWindowSeconds must have the same value to work properly, in my case 600 seconds.
I can change the end expression to any value.

apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name: myapp
spec:
  scaleTargetRef:
    name: myapp
  minReplicaCount: 3                                 
  maxReplicaCount: 10
  cooldownPeriod: 600                                
  advanced:                                          
    restoreToOriginalReplicaCount: true               
    horizontalPodAutoscalerConfig:                   
      behavior:                                      
        scaleDown:
          stabilizationWindowSeconds: 600
  triggers:
  - type: cron
    metadata:
      timezone: America/Sao_Paulo
      start: "25 * * * *"
      end:  "35 * * * *"
      desiredReplicas: "10"

Expected Behavior

I would like to only use the expressions Start and End for the CRON itself.
As mentioned in the documentation.

triggers:
- type: cron
  metadata:
    # Required
    timezone: Asia/Kolkata  # The acceptable values would be a value from the IANA Time Zone Database.
    start: 30 * * * *       # Every hour on the 30th minute
    end: 45 * * * *         # Every hour on the 45th minute
    desiredReplicas: "10"

Actual Behavior

I'm setting start and end to run within 10 minutes, but only start is taken into account.

I needed to do the configuration below to solve the scale down:
cooldownPeriod and stabilizationWindowSeconds must have the same value to work properly, in my case 600 seconds.
I can change the end expression to any value.

apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name: myapp
spec:
  scaleTargetRef:
    name: myapp
  minReplicaCount: 3                                 
  maxReplicaCount: 10
  cooldownPeriod: 600                                
  advanced:                                          
    restoreToOriginalReplicaCount: true               
    horizontalPodAutoscalerConfig:                   
      behavior:                                      
        scaleDown:
          stabilizationWindowSeconds: 600
  triggers:
  - type: cron
    metadata:
      timezone: America/Sao_Paulo
      start: "25 * * * *"
      end:  "35 * * * *"
      desiredReplicas: "10"

Steps to Reproduce the Problem

If you run the code to trigger a deployment using Cron the problem will occur.

apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name: myapp
spec:
  scaleTargetRef:
    name: myapp
  minReplicaCount: 3                                 
  maxReplicaCount: 10
  cooldownPeriod: 600                                
  advanced:                                          
    restoreToOriginalReplicaCount: true               
    horizontalPodAutoscalerConfig:                   
      behavior:                                      
        scaleDown:
          stabilizationWindowSeconds: 600
  triggers:
  - type: cron
    metadata:
      timezone: America/Sao_Paulo
      start: "25 * * * *"
      end:  "35 * * * *"
      desiredReplicas: "10"

Logs from KEDA operator

No response

KEDA Version

2.3.0

Kubernetes Version

1.18

Platform

Amazon Web Services

Scaler Details

Cron

Anything else?

No response

[zroubalik]

Related: #1759

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