[prometheus-elasticsearch-exporter] Add ability to set scheme for probes

[timp87]

Is your feature request related to a problem ?

One may have security requirement to scrape exporters via HTTPS only.

Current 6.4.0 chart version of prometheus-elasticsearch-exporter allows one to:

• create a secret with TLS key/cert via extraManifests and then mount it to the pod via secretMounts
• create a configMap via extraManifests with web-config referring those TLS key/cert
• mount that configMap to the pod via extraVolumes and extraVolumeMounts
• add --web.config.file=<path_to_web_config> to args vu extraArgs

Now exporter can be scraped via HTTPS. The only problem here is hardcoded scheme in the liveness and readiness probes. To make it work properly one need a way to redefine with scheme.

Describe the solution you'd like.

Add ability to set scheme for probes to prometheus-elasticsearch-exporter.

This might be done via adding scheme option to service object in values.yaml.
Or service.metricsPort.name can be used as scheme for probes, like this:

@@ -149,6 +149,7 @@ spec:
             httpGet:
               path: /healthz
               port: {{ .Values.service.metricsPort.name }}
+              scheme: {{ upper .Values.service.metricsPort.name }}
             initialDelaySeconds: 5
             timeoutSeconds: 5
             periodSeconds: 5
@@ -156,6 +157,7 @@ spec:
             httpGet:
               path: /healthz
               port: {{ .Values.service.metricsPort.name }}
+              scheme: {{ upper .Values.service.metricsPort.name }}
             initialDelaySeconds: 1
             timeoutSeconds: 5
             periodSeconds: 5

Or there might be a better way like dedicating a separate variable for scheme

Describe alternatives you've considered.

N/A only forking

Additional context.

No response

[timp87]

NOTE: there is also deployment.metricsPort and podMonitor.scheme vars might be involved (used in templates/podmonitor.yaml) as well as serviceMonitor.scheme (used in templates/servicemonitor.yaml)

[timp87]

The same approach would be better

helm-charts/charts/prometheus-statsd-exporter/values.yaml

Lines 56 to 64 in 1c5bc2c

	livenessProbe:
	httpGet:
	path: /health
	port: http
	readinessProbe:
	httpGet:
	path: /health
	port: http