metrics: adjust generate-metrics-config to use controller-gen

Author: chrischdi

Makefile

@@ -615,18 +615,12 @@ generate-e2e-templates-main: $(KUSTOMIZE)
 	$(KUSTOMIZE) build $(INMEMORY_TEMPLATES)/main/cluster-template --load-restrictor LoadRestrictionsNone > $(INMEMORY_TEMPLATES)/main/cluster-template.yaml
 
 .PHONY: generate-metrics-config
-generate-metrics-config: $(ENVSUBST_BIN) ## Generate ./config/metrics/crd-metrics-config.yaml
-	OUTPUT_FILE="./config/metrics/crd-metrics-config.yaml"; \
-	METRIC_TEMPLATES_DIR="./config/metrics/templates"; \
-	echo "# This file was auto-generated via: make generate-metrics-config" > "$${OUTPUT_FILE}"; \
-	cat "$${METRIC_TEMPLATES_DIR}/header.yaml" >> "$${OUTPUT_FILE}"; \
-	for resource in clusterclass cluster kubeadmcontrolplane kubeadmconfig machine machinedeployment machinehealthcheck machineset machinepool; do \
-		cat "$${METRIC_TEMPLATES_DIR}/$${resource}.yaml"; \
-		RESOURCE="$${resource}" ${ENVSUBST_BIN} < "$${METRIC_TEMPLATES_DIR}/common_metrics.yaml"; \
-		if [[ "$${resource}" != "cluster" ]]; then \
-			cat "$${METRIC_TEMPLATES_DIR}/owner_metric.yaml"; \
-		fi \
-	done >> "$${OUTPUT_FILE}"; \
+generate-metrics-config: $(CONTROLLER_GEN) ## Generate ./config/metrics/crd-metrics-config.yaml
+	$(CONTROLLER_GEN) metrics output:metrics:dir=./config/metrics \
+		paths=./api/... \
+		paths=./controlplane/kubeadm/api/... \
+		paths=./bootstrap/kubeadm/api/... \
+		paths=./exp/api/...
 
 .PHONY: generate-diagrams
 generate-diagrams: ## Generate diagrams for *.plantuml files