Short-form DNS names (e.g. postgres.databases.svc) fail to resolve in
new pods due to k8s DNS search domain limitations. Switch all service
hostnames to FQDNs (*.svc.cluster.local).
Remove commonLabels from kustomization.yaml — it injected labels into
all selectors including NetworkPolicy egress rules (blocking DNS to
CoreDNS) and Deployment selectors (causing immutability errors).
Add OTEL_EXPORTER_OTLP_ENDPOINT env var to deployment YAML so the
telemetry collector endpoint uses the FQDN without requiring a binary
rebuild.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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