Removes deprecated policy/v1beta1 API from PodDisruptionBudget templates

[renatovassaomb]

Summary

This PR removes deprecated policy/v1beta1 API from flagger and load tester templates, since it stopped being served in Kubernetes 1.25, which is EOL since Oct 2023.

Changes

• Removes conditional statement from helm template checking API server Capabilities

Testing

Local templating with helm template and helm install --dry-run:

> helm template flagger ./charts/flagger --set podDisruptionBudget.enabled=true | head                                             
---
# Source: flagger/templates/pdb.yaml
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: flagger
  namespace: default
spec:
  minAvailable: 1
  selector:

> helm template flagger ./charts/loadtester --set podDisruptionBudget.enabled=true | head    
---
# Source: loadtester/templates/pdb.yaml
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: flagger-loadtester
spec:
  minAvailable: 1
  selector:
    matchLabels:

> helm install flagger ./charts/flagger --dry-run --set podDisruptionBudget.enabled=true | head -n 15
level=WARN msg="--dry-run is deprecated and should be replaced with '--dry-run=client'"
NAME: flagger
LAST DEPLOYED: Fri Mar  6 10:18:28 2026
NAMESPACE: default
STATUS: pending-install
REVISION: 1
DESCRIPTION: Dry run complete
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: flagger/templates/pdb.yaml
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: flagger

> helm install flagger ./charts/loadtester --dry-run --set podDisruptionBudget.enabled=true | head -n 15
level=WARN msg="--dry-run is deprecated and should be replaced with '--dry-run=client'"
NAME: flagger
LAST DEPLOYED: Fri Mar  6 10:20:21 2026
NAMESPACE: default
STATUS: pending-install
REVISION: 1
DESCRIPTION: Dry run complete
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: loadtester/templates/pdb.yaml
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: flagger-loadtester

[stefanprodan]

LGTM

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.00%. Comparing base (12ee6cb) to head (36a2088).
⚠️ Report is 91 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1885      +/-   ##
==========================================
- Coverage   39.44%   30.00%   -9.44%     
==========================================
  Files         287      287              
  Lines       22706    18467    -4239     
==========================================
- Hits         8956     5541    -3415     
+ Misses      12777    12195     -582     
+ Partials      973      731     -242     

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