An issue was identified with v1beta1 of the BackendConfig API, where a Cloud Armor security policy was inadvertently deleted from the backend Service of an Ingress resource on the following affected GKE versions:
- 1.18.19-gke.1400 and later
- 1.19.10-gke.700 and later
- 1.20.6-gke.700 and later
To fix this issue, use v1 of the BackendConfig API, or update your clusters to one of the following GKE versions:
- 1.20.9-gke.900 and later
- 1.21.1-gke.2700 and later
For more information, see Kubernetes issue #1508 and the Ingress Known issues page.
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