[prometheus-adapter] Allow specifying service account annotations (#1029)

* Allow specifying service account annotations

Signed-off-by: Chris Sng <chrissng@users.noreply.github.com>

* minor version bump

Signed-off-by: Chris Sng <chrissng@users.noreply.github.com>

charts/prometheus-adapter/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: prometheus-adapter
-version: 2.13.0
+version: 2.14.0
 appVersion: v0.8.4
 description: A Helm chart for k8s prometheus adapter
 home: https://github.com/DirectXMan12/k8s-prometheus-adapter

charts/prometheus-adapter/templates/serviceaccount.yaml

@@ -9,4 +9,8 @@ metadata:
     heritage: {{ .Release.Service }}
   name: {{ template "k8s-prometheus-adapter.serviceAccountName" . }}
   namespace: {{ .Release.Namespace }}
+{{- if .Values.serviceAccount.annotations }}
+  annotations:
+{{ toYaml .Values.serviceAccount.annotations | indent 4 }}
+{{- end }}
 {{- end -}}

charts/prometheus-adapter/values.yaml

@@ -39,6 +39,11 @@ serviceAccount:
   # The name of the service account to use.
   # If not set and create is true, a name is generated using the fullname template
   name:
+  # ServiceAccount annotations.
+  # Use case: AWS EKS IAM roles for service accounts
+  # ref: https://docs.aws.amazon.com/eks/latest/userguide/specify-service-account-role.html
+  annotations: {}
+
 # Custom DNS configuration to be added to prometheus-adapter pods
 dnsConfig: {}
 # nameservers: