feat: expose topologySpreadConstraints for admin-api pods (#14995)

Author: mericks

docs/sources/setup/install/helm/reference.md

@@ -82,7 +82,8 @@ This is the generated reference for the Loki Helm Chart values.
     "type": "RollingUpdate"
   },
   "terminationGracePeriodSeconds": 60,
-  "tolerations": []
+  "tolerations": [],
+  "topologySpreadConstraints": []
 }
 </pre>
 </td>
@@ -280,6 +281,15 @@ This is the generated reference for the Loki Helm Chart values.
 			<td><pre lang="json">
 []
 </pre>
+</td>
+		</tr>
+		<tr>
+			<td>adminApi.topologySpreadConstraints</td>
+			<td>list</td>
+			<td>Topology Spread Constraints for admin-api pods</td>
+			<td><pre lang="json">
+[]
+</pre>
 </td>
 		</tr>
 		<tr>

production/helm/loki/templates/admin-api/deployment-admin-api.yaml

@@ -38,6 +38,12 @@ spec:
         {{- toYaml . | nindent 8 }}
         {{- end }}
     spec:
+      {{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.Version }}
+      {{- with .Values.adminApi.topologySpreadConstraints }}
+      topologySpreadConstraints:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- end }}
       serviceAccountName: {{ template "loki.serviceAccountName" . }}
       {{- if .Values.adminApi.priorityClassName }}
       priorityClassName: {{ .Values.adminApi.priorityClassName }}
@@ -167,4 +173,4 @@ spec:
                 path: CAs/public.crt
         {{- end }}
         {{- end }}
-{{- end }}
+{{- end }}

production/helm/loki/values.yaml

@@ -876,6 +876,8 @@ adminApi:
   affinity: {}
   # -- Node selector for admin-api Pods
   nodeSelector: {}
+  # -- Topology Spread Constraints for admin-api pods
+  topologySpreadConstraints: []
   # -- Tolerations for admin-api Pods
   tolerations: []
   # -- Grace period to allow the admin-api to shutdown before it is killed