ci: validate component inventory

Makefile

@@ -19,7 +19,7 @@ NRLICENSE := $(TOOLS_BIN_DIR)/nrlicense
 
 DISTRIBUTIONS ?= "nrdot-collector,nrdot-collector-experimental"
 
-ci: check manifests-check build build-fips version-check licenses-check
+ci: check manifests-check component-inventory-check build build-fips version-check licenses-check
 check: ensure-goreleaser-up-to-date
 
 build: go ocb
@@ -42,9 +42,6 @@ goreleaser-verify: goreleaser
 ensure-goreleaser-up-to-date: generate-goreleaser
 	@git diff -s --exit-code distributions/*/.goreleaser*.yaml || (echo "Check failed: The goreleaser templates have changed but the .goreleaser.yamls haven't. Run 'make generate-goreleaser' and update your PR." && exit 1)
 
-validate-components:
-	@./scripts/validate-components.sh
-
 .PHONY: ocb
 ocb:
 ifeq (, $(shell command -v ocb 2>/dev/null))
@@ -185,4 +182,11 @@ manifests-check:
 		echo "NRDOT Experimental manifest out of sync with Core. Diff:"; \
 		echo "$${diff}"; \
 		exit 1; \
-	} || exit 0
+	} || exit 0
+
+# Check that each distro's component-inventory.yaml (if present) matches its manifest.yaml
+.PHONY: component-inventory-check
+component-inventory-check:
+	@for distro in $$(echo ${DISTRIBUTIONS} | tr ',' ' ' | tr -d '"'); do \
+		./scripts/validate-component-inventory.sh "$$distro" || exit 1; \
+	done

distributions/nrdot-collector/component-inventory.yaml

@@ -0,0 +1,73 @@
+# Component Inventory
+#
+# Maps each component in the `nrdot-collector` distribution to the use cases
+# that require it. As use cases evolve and begin to use components already
+# present in the distro, this list might become stale and need updating, so
+# it's not meant to be authoritative — it's best-effort context for maintainers.
+#
+# This file is validated against manifest.yaml by
+# scripts/validate-component-inventory.sh (run as part of `make ci`). Component
+# names must match the path suffix after /<category>/ in the manifest's gomod
+# value (e.g. `extension/observer/dockerobserver` -> `observer/dockerobserver`).
+#
+# Use-case legend:
+#   Core    - Core (not use-case specific)
+#   Host    - Host Monitoring
+#   k8s     - Kubernetes Monitoring
+#   ATP     - Host Monitoring with process metrics
+#   Gateway - Gateway Mode
+#   OHI     - On-Host Integrations
+
+receivers:
+  dockerstatsreceiver: [OHI]
+  elasticsearchreceiver: [OHI]
+  filelogreceiver: [Host, k8s]
+  hostmetricsreceiver: [Host, k8s, OHI]
+  jmxreceiver: [OHI]
+  k8seventsreceiver: [OHI, k8s]
+  kafkametricsreceiver: [OHI]
+  kubeletstatsreceiver: [OHI, k8s]
+  nginxreceiver: [OHI]
+  otlpreceiver: [Core]
+  prometheusreceiver: [Gateway, k8s]
+  rabbitmqreceiver: [OHI]
+  receivercreator: [OHI]
+
+processors:
+  adaptivetelemetryprocessor: [ATP]
+  attributesprocessor: [Core]
+  batchprocessor: [Core]
+  cumulativetodeltaprocessor: [Core]
+  filterprocessor: [Core]
+  groupbyattrsprocessor: [k8s, Gateway]
+  k8sattributesprocessor: [k8s, ATP, OHI]
+  memorylimiterprocessor: [Core]
+  metricsgenerationprocessor: [k8s, ATP, OHI]
+  metricstransformprocessor: [Core]
+  resourcedetectionprocessor: [Core]
+  resourceprocessor: [k8s, Gateway]
+  spanprocessor: [Gateway]
+  tailsamplingprocessor: [Gateway]
+  transformprocessor: [Core]
+
+exporters:
+  debugexporter: [Core]
+  loadbalancingexporter: [Gateway]
+  otlpexporter: [Core]
+  otlphttpexporter: [Core]
+
+connectors:
+  routingconnector: [Core]
+
+extensions:
+  healthcheckextension: [Core]
+  observer/dockerobserver: [OHI]
+  observer/hostobserver: [OHI]
+  observer/k8sobserver: [OHI]
+
+providers:
+  envprovider: [Core]
+  fileprovider: [Core]
+  httpprovider: [Core]
+  httpsprovider: [Core]
+  yamlprovider: [Core]

scripts/validate-component-inventory.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+# Copyright New Relic, Inc. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+# Validate that distributions/<distro>/component-inventory.yaml lists exactly
+# the components present in distributions/<distro>/manifest.yaml.
+#
+# Usage: scripts/validate-component-inventory.sh <distribution>
+#
+# Exits 0 if the inventory file does not exist (the check is opt-in per distro).
+# Exits 0 if every component category matches in both directions.
+# Exits 1 with a per-category diff when there is drift.
+
+set -euo pipefail
+
+if [[ $# -ne 1 ]]; then
+    echo "usage: $0 <distribution>" >&2
+    exit 2
+fi
+
+DISTRO="$1"
+SRC_ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
+DIR="${SRC_ROOT}/distributions/${DISTRO}"
+MANIFEST="${DIR}/manifest.yaml"
+INVENTORY="${DIR}/component-inventory.yaml"
+
+if [[ ! -f "$INVENTORY" ]]; then
+    echo "ℹ️  ${DISTRO}: no component-inventory.yaml, skipping check"
+    exit 0
+fi
+
+if [[ ! -f "$MANIFEST" ]]; then
+    echo "❌ ${DISTRO}: manifest.yaml not found at ${MANIFEST}" >&2
+    exit 1
+fi
+
+# plural manifest section -> singular path segment used in gomod URLs
+CATEGORIES=(
+    "receivers:receiver"
+    "processors:processor"
+    "exporters:exporter"
+    "connectors:connector"
+    "extensions:extension"
+    "providers:provider"
+)
+
+failed=0
+for entry in "${CATEGORIES[@]}"; do
+    plural="${entry%%:*}"
+    singular="${entry##*:}"
+
+    manifest_components=$(yq -r "
+        .${plural}[]?.gomod
+        | sub(\" v[0-9].*$\"; \"\")
+        | sub(\".*/${singular}/\"; \"\")
+    " "$MANIFEST" | sort -u)
+
+    inventory_components=$(yq -r "
+        .${plural} // {} | keys | .[]
+    " "$INVENTORY" | sort -u)
+
+    if ! diff_output=$(diff <(echo "$manifest_components") <(echo "$inventory_components")); then
+        echo "❌ ${DISTRO} ${plural}: manifest and inventory disagree"
+        echo "$diff_output" | sed 's/^/   /'
+        failed=1
+    fi
+done
+
+if [[ $failed -eq 1 ]]; then
+    echo
+    echo "   Manifest:  ${MANIFEST}"
+    echo "   Inventory: ${INVENTORY}"
+    echo "   '<' lines are only in the manifest; '>' lines are only in the inventory."
+    exit 1
+fi
+
+echo "✅ ${DISTRO}: component inventory matches manifest"