Kubernetes ingress report

ingress-report.sh

# Lists:
#   - number of ingresses
#   - number of ingress classes used
#   - ingress classes used
#   - ingresses without explicit ingress class with name and namespace
#   - ingresses by class with name and namespace
# Dependencies: kubectl, jq
function ingress-report() {
	echo "Loading ingresses from the cluster"
	local INGRESSES=$(kubectl get ingresses -o json --all-namespaces)
  
	echo "Total number of ingress resources: $(echo $INGRESSES | jq '.items | length')"
	echo "Classes in use (includes implicit class): $(echo $INGRESSES | jq -r '[.items[].metadata.annotations["kubernetes.io/ingress.class"]] | unique | length')"
	echo "-----------------------------------"
	echo "Ingresses without an explicit class:"
	echo $INGRESSES | jq -r '.items | map(select(.metadata.annotations["kubernetes.io/ingress.class"] == null)) | .[] | "  - namespace: \(.metadata.namespace), name: \(.metadata.name)"'

	for i in $(echo $INGRESSES | jq -r '[.items[].metadata.annotations["kubernetes.io/ingress.class"]] | unique | .[]'); do
		if [ $i == "null" ]; then
			continue
		fi
		echo "-----------------------------------"
		echo "Ingresses for class $i"
		echo Count: $(echo $INGRESSES | jq --arg i $i -r '.items | map(select(.metadata.annotations["kubernetes.io/ingress.class"] == $i)) | length')		
		echo $INGRESSES | jq --arg i $i -r '.items | map(select(.metadata.annotations["kubernetes.io/ingress.class"] == $i )) | .[] | "  - namespace: \(.metadata.namespace), name: \(.metadata.name)"'
	done
}