MGMT-22067: Validation is preventing TNA arbiter cluster deployment

libs/locales/lib/en/translation.json

@@ -327,6 +327,7 @@
   "ai:Error parsing cluster feature_usage field": "Error parsing cluster feature_usage field",
   "ai:Events table": "Events table",
   "ai:Exactly 1 host is required, capable of functioning both as control plane and worker node.": "Exactly 1 host is required, capable of functioning both as control plane and worker node.",
+  "ai:Exactly 2 hosts capable of functioning as control plane nodes, and one arbiter, are required.": "Exactly 2 hosts capable of functioning as control plane nodes, and one arbiter, are required.",
   "ai:Exclude destination domain names, IP addresses, or other network CIDRs from proxying by adding them to this comma-separated list.": "Exclude destination domain names, IP addresses, or other network CIDRs from proxying by adding them to this comma-separated list.",
   "ai:Exposes the service externally using a cloud provider's load balancer": "Exposes the service externally using a cloud provider's load balancer",
   "ai:Exposes the service on each node's IP at a static port": "Exposes the service on each node's IP at a static port",

libs/ui-lib/lib/cim/components/ClusterDeployment/hostSelection/ClusterDeploymentHostSelectionStep.tsx

@@ -45,9 +45,12 @@ const getInitialValues = ({
   const isSNOCluster = getIsSNOCluster(agentClusterInstall);
   const cdName = clusterDeployment?.metadata?.name;
   const cdNamespace = clusterDeployment?.metadata?.namespace;
+
   let hostCount =
     (agentClusterInstall?.spec?.provisionRequirements?.controlPlaneAgents || 0) +
+    (agentClusterInstall?.spec?.provisionRequirements?.arbiterAgents || 0) +
     (agentClusterInstall?.spec?.provisionRequirements?.workerAgents || 0);
+
   if (isSNOCluster) {
     hostCount = 1;
   } else if (hostCount === 2 || hostCount === 0) {

libs/ui-lib/lib/cim/components/ClusterDeployment/hostSelection/ClusterDeploymentHostsSelection.tsx

@@ -12,10 +12,25 @@ import {
   getAgentsForSelection,
   getClusterDeploymentCpuArchitecture,
   getIsSNOCluster,
+  getIsTNACluster,
 } from '../../helpers';
 import MinimalHWRequirements from '../../Agent/MinimalHWRequirements';
 import NoAgentsAlert from '../../Agent/NoAgentsAlert';
 import { useTranslation } from '../../../../common/hooks/use-translation-wrapper';
+import { TFunction } from 'i18next';
+
+const getHostRequirementText = (isSNO: boolean, isTNA: boolean, t: TFunction) => {
+  if (isSNO) {
+    return t(
+      'ai:Exactly 1 host is required, capable of functioning both as control plane and worker node.',
+    );
+  } else if (isTNA) {
+    return t(
+      'ai:Exactly 2 hosts capable of functioning as control plane nodes, and one arbiter, are required.',
+    );
+  }
+  return t('ai:At least 3 hosts are required, capable of functioning as control plane nodes.');
+};
 
 const ClusterDeploymentHostsSelection: React.FC<ClusterDeploymentHostsSelectionProps> = ({
   agentClusterInstall,
@@ -28,9 +43,11 @@ const ClusterDeploymentHostsSelection: React.FC<ClusterDeploymentHostsSelectionP
   onSetInstallationDiskId,
   isNutanix,
 }) => {
+  const { t } = useTranslation();
   const { values } = useFormikContext<ClusterDeploymentHostsSelectionValues>();
   const { autoSelectHosts } = values;
   const isSNOCluster = getIsSNOCluster(agentClusterInstall);
+  const isTNA = getIsTNACluster(agentClusterInstall);
 
   const cdName = clusterDeployment?.metadata?.name;
   const cdNamespace = clusterDeployment?.metadata?.namespace;
@@ -45,22 +62,20 @@ const ClusterDeploymentHostsSelection: React.FC<ClusterDeploymentHostsSelectionP
           !agent.spec.clusterDeploymentName?.namespace &&
           agent.status?.inventory.cpu?.architecture === cpuArchitecture),
     );
+
     return isNutanix
       ? filtered.filter((a) => a.status?.inventory?.systemVendor?.manufacturer === 'Nutanix')
       : filtered;
   }, [agents, cdNamespace, cdName, cpuArchitecture, isNutanix]);
-  const { t } = useTranslation();
+
+  const hostRequirementText = getHostRequirementText(isSNOCluster, isTNA, t);
+
   return (
     <Grid hasGutter>
       <GridItem>
-        <TextContent>
-          {isSNOCluster
-            ? t(
-                'ai:Exactly 1 host is required, capable of functioning both as control plane and worker node.',
-              )
-            : t('ai:At least 3 hosts are required, capable of functioning as control plane nodes.')}
-        </TextContent>
+        <TextContent>{hostRequirementText}</TextContent>
       </GridItem>
+
       {aiConfigMap && (
         <GridItem>
           <MinimalHWRequirements aiConfigMap={aiConfigMap} isSNOCluster={isSNOCluster} />

libs/ui-lib/lib/cim/components/helpers/agentClusterInstall.ts

@@ -4,6 +4,10 @@ import { getClusterNameOfAgent } from './agents';
 export const getIsSNOCluster = (agentClusterInstall?: AgentClusterInstallK8sResource) =>
   agentClusterInstall?.spec?.provisionRequirements?.controlPlaneAgents === 1;
 
+export const getIsTNACluster = (agentClusterInstall?: AgentClusterInstallK8sResource) =>
+  agentClusterInstall?.spec?.provisionRequirements.arbiterAgents === 1 &&
+  agentClusterInstall.spec.provisionRequirements.controlPlaneAgents === 2;
+
 export const getAgentClusterInstallOfAgent = (
   agentClusterInstalls: AgentClusterInstallK8sResource[],
   agent?: AgentK8sResource,