Helm/loki-stack: add template for the service name to connect to loki (#1587)

* add helper for the service name to connect to loki

* Bump loki-chart version.

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

Co-authored-by: Cyril Tovena <cyril.tovena@gmail.com>

production/helm/loki-stack/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: "v1"
 name: loki-stack
-version: 0.27.0
+version: 0.27.1
 appVersion: v1.3.0
 kubeVersion: "^1.10.0-0"
 description: "Loki: like Prometheus, but for logs."

production/helm/loki-stack/templates/_helpers.tpl

@@ -37,4 +37,22 @@ Added as a fix for https://github.com/grafana/loki/issues/1169
 */}}
 {{- define "prometheus.fullname" -}}
 {{- printf "%s-%s" .Release.Name "prometheus-server" | trunc 63 | trimSuffix "-" -}}
-{{- end -}}
+{{- end -}}
+
+{{/*
+The service name to connect to Loki. Defaults to the same logic as "loki.fullname"
+*/}}
+{{- define "loki.serviceName" -}}
+{{- if .Values.loki.serviceName -}}
+{{- .Values.loki.serviceName -}}
+{{- else if .Values.loki.fullnameOverride -}}
+{{- .Values.loki.fullnameOverride | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- $name := default "loki" .Values.loki.nameOverride -}}
+{{- if contains $name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+{{- end -}}