[prometheus] allow boolean pushgateway extraArgs (#1076)

* allow boolean pushgateway extraArgs

Signed-off-by: marius.schmidt <gietschess@gmail.com>

* string comparison

Signed-off-by: marius.schmidt <gietschess@gmail.com>

Co-authored-by: marius.schmidt <gietschess@gmail.com>
Co-authored-by: André Bauer <monotek@users.noreply.github.com>

charts/prometheus/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 name: prometheus
 appVersion: 2.26.0
-version: 14.1.3
+version: 14.2.0
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/
 icon: https://raw.githubusercontent.com/prometheus/prometheus.github.io/master/assets/prometheus_logo-cb55bb5c346.png

charts/prometheus/templates/pushgateway/deploy.yaml

@@ -31,9 +31,9 @@ spec:
     {{- end }}
       labels:
         {{- include "prometheus.pushgateway.labels" . | nindent 8 }}
-        {{- if .Values.pushgateway.podLabels}}
+        {{- if .Values.pushgateway.podLabels }}
         {{ toYaml .Values.pushgateway.podLabels | nindent 8 }}
-        {{- end}}
+        {{- end }}
     spec:
       serviceAccountName: {{ template "prometheus.serviceAccountName.pushgateway" . }}
       {{- if .Values.pushgateway.extraInitContainers }}
@@ -49,8 +49,13 @@ spec:
           imagePullPolicy: "{{ .Values.pushgateway.image.pullPolicy }}"
           args:
           {{- range $key, $value := .Values.pushgateway.extraArgs }}
+          {{- $stringvalue := toString $value }}
+          {{- if eq $stringvalue "true" }}
+            - --{{ $key }}
+          {{- else }}
             - --{{ $key }}={{ $value }}
           {{- end }}
+          {{- end }}
           ports:
             - containerPort: 9091
           livenessProbe: