kubectl api-resources --no-headers | \
awk '{print $1}' | \
xargs -I '{}' kubectl get '{}' --all-namespaces -o json 2>/dev/null | \
jq '.items[] | \
select((.metadata.ownerReferences // [])[] | \
select(.kind == "YourCRD"))'
Credits: Oleg Matskiv
kubectl api-resources --no-headers | \
awk '{print $1}' | \
xargs -I '{}' kubectl get '{}' --all-namespaces -o json 2>/dev/null | \
jq '.items[] | \
select((.metadata.ownerReferences // [])[] | \
select(.kind == "YourCRD"))'
Credits: Oleg Matskiv