fix(helm): Use correct serviceName in zone-aware ingester statefulsets (#18558)

Signed-off-by: Emmanuel Meinen <mannymeinen@gmail.com>
Co-authored-by: Jan-Otto Kröpke <mail@jkroepke.de>
Co-authored-by: J Stickler <julie.stickler@grafana.com>

Author: 3 people

production/helm/loki/CHANGELOG.md

@@ -12,6 +12,7 @@ Entries should be ordered as follows:
 Entries should include a reference to the pull request that introduced the change.
 
 [//]: # (<AUTOMATED_UPDATES_LOCATOR> : do not remove this line. This locator is used by the CI pipeline to automatically create a changelog entry for each new Loki release. Add other chart versions and respective changelog entries bellow this line.)
+- [BUGFIX] Fix serviceName in zone-aware ingester statefulsets [#18558](https://github.com/grafana/loki/pull/18558)
 ## 6.33.0
 
 - [FEATURE] Allow passing tenant password hash instead of password. [#17049](https://github.com/grafana/loki/pull/17049)

production/helm/loki/templates/ingester/statefulset-ingester-zone-a.yaml

@@ -24,7 +24,7 @@ spec:
   replicas: {{ $replicas }}
 {{- end }}
   podManagementPolicy: Parallel
-  serviceName: {{ include "loki.ingesterFullname" . }}-zone-a
+  serviceName: {{ include "loki.ingesterFullname" . }}-zone-a-headless
   revisionHistoryLimit: {{ .Values.loki.revisionHistoryLimit }}
   {{- if and (semverCompare ">= 1.23-0" (include "loki.kubeVersion" .)) (.Values.ingester.persistence.enableStatefulSetAutoDeletePVC)  }}
   {{/*

production/helm/loki/templates/ingester/statefulset-ingester-zone-b.yaml

@@ -24,7 +24,7 @@ spec:
   replicas: {{ $replicas }}
 {{- end }}
   podManagementPolicy: Parallel
-  serviceName: {{ include "loki.ingesterFullname" . }}-zone-b
+  serviceName: {{ include "loki.ingesterFullname" . }}-zone-b-headless
   revisionHistoryLimit: {{ .Values.loki.revisionHistoryLimit }}
   {{- if and (semverCompare ">= 1.23-0" (include "loki.kubeVersion" .)) (.Values.ingester.persistence.enableStatefulSetAutoDeletePVC)  }}
   {{/*

production/helm/loki/templates/ingester/statefulset-ingester-zone-c.yaml

@@ -24,7 +24,7 @@ spec:
   replicas: {{ $replicas }}
 {{- end }}
   podManagementPolicy: Parallel
-  serviceName: {{ include "loki.ingesterFullname" . }}-zone-c
+  serviceName: {{ include "loki.ingesterFullname" . }}-zone-c-headless
   revisionHistoryLimit: {{ .Values.loki.revisionHistoryLimit }}
   {{- if and (semverCompare ">= 1.23-0" (include "loki.kubeVersion" .)) (.Values.ingester.persistence.enableStatefulSetAutoDeletePVC)  }}
   {{/*