feat(cardano-node): support fallbackScrapeProtocol for Prometheus v3 (#317)

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

Author: wcatz

charts/cardano-node/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 name: cardano-node
 description: Creates a Cardano node deployment with SOCAT sidecar
-version: 0.7.0
+version: 0.7.1
 appVersion: 10.5.3
 maintainers:
   - name: aurora

charts/cardano-node/templates/podmonitor.yaml

@@ -10,6 +10,9 @@ metadata:
 {{ toYaml . | indent 4 }}
 {{- end }}
 spec:
+{{- with .Values.podMonitor.fallbackScrapeProtocol }}
+  fallbackScrapeProtocol: {{ . | quote }}
+{{- end }}
   selector:
     matchLabels:
       {{- include "cardano-node.matchLabels" . | nindent 6 }}

charts/cardano-node/values.yaml

@@ -112,6 +112,8 @@ tolerations:
 podMonitor:
   enabled: false
   # extraLabels: {}
+  # Required for Prometheus >= v3.0.0
+  fallbackScrapeProtocol: "PrometheusText0.0.4"
   podMetricsEndpoints:
     - port: metrics
       path: /metrics