feat(chart): render extraManifests and serviceMonitor (#1348)

Signed-off-by: tlongwell-block <109685178+tlongwell-block@users.noreply.github.com>
Co-authored-by: Dawn (sprout agent) <c6237ef84fa537c78dcee78efd2d4e59f728859c7f194da42ac51ededfa0be05@sprout-oss.stage.blox.sqprod.co>
Co-authored-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@sprout-oss.stage.blox.sqprod.co>

deploy/charts/buzz/templates/extramanifests.yaml

@@ -0,0 +1,10 @@
+{{- /*
+Free-form extra manifests. Each entry in .Values.extraManifests is rendered
+through `tpl` (so entries may reference release values / helpers) and emitted
+as its own document. Lets operators ship companion objects (e.g. Istio mesh
+glue, NetworkPolicies) alongside the relay without forking the chart.
+*/ -}}
+{{- range .Values.extraManifests }}
+---
+{{ tpl (toYaml .) $ }}
+{{- end }}

deploy/charts/buzz/templates/servicemonitor.yaml

@@ -0,0 +1,31 @@
+{{- /*
+Prometheus Operator ServiceMonitor for the relay's /metrics endpoint.
+Opt-in (serviceMonitor.enabled). Selects the relay Service by the chart's
+selector labels (which the Service carries in its own metadata.labels) and
+scrapes the named `metrics` port.
+*/ -}}
+{{- if .Values.serviceMonitor.enabled -}}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "buzz.fullname" . }}
+  {{- with .Values.serviceMonitor.namespace }}
+  namespace: {{ . | quote }}
+  {{- end }}
+  labels:
+    {{- include "buzz.labels" . | nindent 4 }}
+    {{- with .Values.serviceMonitor.labels }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+spec:
+  selector:
+    matchLabels:
+      {{- include "buzz.selectorLabels" . | nindent 6 }}
+  endpoints:
+    - port: metrics
+      interval: {{ .Values.serviceMonitor.interval | quote }}
+      scrapeTimeout: {{ .Values.serviceMonitor.scrapeTimeout | quote }}
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+{{- end -}}

deploy/charts/buzz/tests/extras_test.yaml

@@ -0,0 +1,70 @@
+suite: extraManifests + serviceMonitor renderers
+templates:
+  - templates/extramanifests.yaml
+  - templates/servicemonitor.yaml
+set:
+  relayUrl: wss://buzz.example.com
+  ownerPubkey: "0000000000000000000000000000000000000000000000000000000000000000"
+  externalPostgresql.url: postgres://u:p@h:5432/d
+  externalRedis.url: redis://h:6379
+  s3.endpoint: http://minio:9000
+  s3.accessKey: a
+  s3.secretKey: s
+tests:
+  - it: emits nothing by default (extraManifests empty)
+    template: templates/extramanifests.yaml
+    asserts:
+      - hasDocuments:
+          count: 0
+
+  - it: renders each extraManifests entry, tpl-resolving release values
+    template: templates/extramanifests.yaml
+    set:
+      extraManifests:
+        - apiVersion: v1
+          kind: ConfigMap
+          metadata:
+            name: '{{ include "buzz.fullname" . }}-extra'
+          data:
+            host: '{{ .Values.relayUrl }}'
+    asserts:
+      - hasDocuments:
+          count: 1
+      - equal:
+          path: kind
+          value: ConfigMap
+      - equal:
+          path: metadata.name
+          value: RELEASE-NAME-buzz-extra
+      - equal:
+          path: data.host
+          value: wss://buzz.example.com
+
+  - it: omits the ServiceMonitor unless enabled
+    template: templates/servicemonitor.yaml
+    asserts:
+      - hasDocuments:
+          count: 0
+
+  - it: renders a ServiceMonitor scraping the metrics port when enabled
+    template: templates/servicemonitor.yaml
+    set:
+      serviceMonitor.enabled: true
+      serviceMonitor.labels.release: kube-prometheus-stack
+    asserts:
+      - hasDocuments:
+          count: 1
+      - equal:
+          path: kind
+          value: ServiceMonitor
+      - equal:
+          path: spec.endpoints[0].port
+          value: metrics
+      - equal:
+          path: spec.selector.matchLabels["app.kubernetes.io/name"]
+          value: buzz
+      - notExists:
+          path: spec.selector.matchLabels["app.kubernetes.io/component"]
+      - equal:
+          path: metadata.labels.release
+          value: kube-prometheus-stack