feat(tx-submit-api): add PodMonitor, metrics port, and extraPodLabels (#355)

* feat(tx-submit-api): add PodMonitor, metrics port, and extraPodLabels

- Add PodMonitor template with configurable podMetricsEndpoints
  and podTargetLabels support
- Expose metrics container port (default 8081) alongside API port
- Add extraPodLabels support for custom pod labels (alias, app, etc.)
- Bump chart version to 0.1.20

Signed-off-by: wcatz <waynecataldo@gmail.com>

* fix(tx-submit-api): render extraPodLabels before selectorLabels

Ensures selector labels always take precedence over extraPodLabels,
preventing accidental override of labels used in matchLabels.

Signed-off-by: wcatz <waynecataldo@gmail.com>

---------

Signed-off-by: wcatz <waynecataldo@gmail.com>

Author: wcatz

charts/tx-submit-api/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 name: tx-submit-api
 description: Creates a Cardano Tx Submit API deployment
-version: 0.1.19
+version: 0.1.20
 appVersion: 0.20.9
 maintainers:
   - name: aurora

charts/tx-submit-api/templates/deployment.yaml

@@ -15,7 +15,11 @@ spec:
     matchLabels: {{ include "tx-submit-api.selectorLabels" . | nindent 6 }}
   template:
     metadata:
-      labels: {{ include "tx-submit-api.selectorLabels" . | nindent 8 }}
+      labels:
+        {{- with .Values.extraPodLabels }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
+        {{- include "tx-submit-api.selectorLabels" . | nindent 8 }}
     spec:
       {{- if .Values.affinity }}
       affinity: {{ .Values.affinity | toYaml | nindent 8 }}
@@ -35,7 +39,9 @@ spec:
         imagePullPolicy: IfNotPresent
         ports:
         - name: api
-          containerPort: 8090
+          containerPort: {{ .Values.service.apiPort | default 8090 }}
+        - name: metrics
+          containerPort: {{ .Values.service.metricsPort | default 8081 }}
         readinessProbe:
           httpGet:
             path: /healthcheck

charts/tx-submit-api/templates/podmonitor.yaml

@@ -0,0 +1,32 @@
+---
+{{- if .Values.podMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: PodMonitor
+metadata:
+  name: {{ include "tx-submit-api.fullname" . }}
+  labels:
+    {{- include "tx-submit-api.labels" . | nindent 4 }}
+{{- with .Values.podMonitor.extraLabels }}
+{{ toYaml . | indent 4 }}
+{{- end }}
+spec:
+  selector:
+    matchLabels: {{- include "tx-submit-api.selectorLabels" . | nindent 6 }}
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+  {{- with .Values.podMonitor.podTargetLabels }}
+  podTargetLabels:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  podMetricsEndpoints:
+    {{- if .Values.podMonitor.podMetricsEndpoints }}
+    {{- toYaml .Values.podMonitor.podMetricsEndpoints | nindent 4 }}
+    {{- else }}
+    - port: metrics
+      path: /metrics
+      scheme: http
+      interval: 30s
+      scrapeTimeout: 10s
+    {{- end }}
+{{- end }}

charts/tx-submit-api/values.yaml

@@ -26,6 +26,14 @@ ingress:
   host: submit-api.preview.local
   secretName: submit-api-preview-local-tls
 
+extraPodLabels: {}
+
+podMonitor:
+  enabled: false
+  extraLabels: {}
+  podMetricsEndpoints: []
+  podTargetLabels: []
+
 service:
   enabled: false
   apiPort: 8090