Agent helm chart needs to have configurable dnsPolicy #13139
Description
Describe the enhancement:
Need to have the ability to override the dnsPolicy in elastic agent deployments.
The templates/agent/k8s/_podTemplate.yaml in the Kubernetes agent helm chart has dnsPolicy hardcoded to ClusterFirstWithHostNet which breaks in our environment (hosted DigitalOcean DOKS)
There needs to be a values.yaml option to override the dnsPolicy
Describe a specific use case for the enhancement or feature:
Elastic components in DigitalOcean's managed clusters cannot make connections between resources (i.e. collectors to gateway, agent to outbound, etc) due to DNS Lookup failures that are resolved by changing 'dnsPolicy: ClusterFirstWithHostNet' to 'dnsPolicy: ClusterFirst'
What is the definition of done?
dnsPolicy must be configurable via the values.yaml file
kubectl get -n infra-observability pods/agent-clusterwide-elastic-agent-0 -o json | jq '.spec.dnsPolicy' should return "ClusterFirst" (or whatever is set in the values.yaml setting