[Fleet] Agent upgrade available should use latest agent version (#167410)

## Summary

Closes https://github.com/elastic/kibana/issues/167387

Replaced using kibana version when deciding if agent upgrade is
available (only in serverless, in stateful kibana version is still
returned as an available version).

To verify locally:
- [to test stateless] add this to `kibana.dev.yml`:
`xpack.fleet.internal.onlyAllowAgentUpgradeToKnownVersions: true`
- extract the `agent_versions_list.json` to local kibana folder
`~/kibana/x-pack/plugins/fleet/target`

[agent_versions_list.json.zip](12739519/agent_versions_list.json.zip)
- verify that upgrade available warnings still work if agent is < latest
agent version (8.10.2)
- when trying to upgrade agent, verify that the default version is the
latest agent version, and 8.11 is not in the list

Agent list:
<img width="1475" alt="image"
src="f06b7bc8-97e6-4ff9-b872-736ede5e969a">

Upgrade available filter - 1 agent on latest version, 9 upgradeable:
<img width="1314" alt="image"
src="4ff5ac02-903b-493b-94df-68b1b7ad6846">

Agent details:
<img width="1512" alt="image"
src="3ff6e1d5-2ccc-4814-83e5-c4760ad63722">

Agent on latest version has disable `Upgrade agent` action:
<img width="1322" alt="image"
src="f461dbf5-04e5-4bcc-8801-48c2b1a90225">

Bulk action with one agent that is not upgradeable (already on latest
version), expected error:
<img width="1597" alt="image"
src="8bfa46ae-6684-4748-9fca-e908c142b642">




### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

x-pack/plugins/fleet/common/services/is_agent_upgradeable.ts

@@ -11,7 +11,11 @@ import semverGt from 'semver/functions/gt';
 
 import type { Agent } from '../types';
 
-export function isAgentUpgradeable(agent: Agent, kibanaVersion: string, versionToUpgrade?: string) {
+export function isAgentUpgradeable(
+  agent: Agent,
+  latestAgentVersion: string,
+  versionToUpgrade?: string
+) {
   let agentVersion: string;
   if (typeof agent?.local_metadata?.elastic?.agent?.version === 'string') {
     agentVersion = agent.local_metadata.elastic.agent.version;
@@ -31,23 +35,23 @@ export function isAgentUpgradeable(agent: Agent, kibanaVersion: string, versionT
   if (versionToUpgrade !== undefined) {
     return (
       isNotDowngrade(agentVersion, versionToUpgrade) &&
-      isAgentVersionLessThanKibana(agentVersion, kibanaVersion)
+      isAgentVersionLessThanLatest(agentVersion, latestAgentVersion)
     );
   }
-  return isAgentVersionLessThanKibana(agentVersion, kibanaVersion);
+  return isAgentVersionLessThanLatest(agentVersion, latestAgentVersion);
 }
 
-export const isAgentVersionLessThanKibana = (agentVersion: string, kibanaVersion: string) => {
+const isAgentVersionLessThanLatest = (agentVersion: string, latestAgentVersion: string) => {
   // make sure versions are only the number before comparison
   const agentVersionNumber = semverCoerce(agentVersion);
   if (!agentVersionNumber) throw new Error('agent version is not valid');
-  const kibanaVersionNumber = semverCoerce(kibanaVersion);
+  const latestAgentVersionNumber = semverCoerce(latestAgentVersion);
-  if (!kibanaVersionNumber) throw new Error('kibana version is not valid');
+  if (!latestAgentVersionNumber) throw new Error('latest version is not valid');
 
-  return semverLt(agentVersionNumber, kibanaVersionNumber);
+  return semverLt(agentVersionNumber, latestAgentVersionNumber);
 };
 
-export const isNotDowngrade = (agentVersion: string, versionToUpgrade: string) => {
+const isNotDowngrade = (agentVersion: string, versionToUpgrade: string) => {
   const agentVersionNumber = semverCoerce(agentVersion);
   if (!agentVersionNumber) throw new Error('agent version is not valid');
   const versionToUpgradeNumber = semverCoerce(versionToUpgrade);

x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_details_page/components/action_menu.test.tsx

@@ -12,14 +12,17 @@ import { createFleetTestRendererMock } from '../../../../../../mock';
 import type { Agent, AgentPolicy } from '../../../../types';
 import { ExperimentalFeaturesService } from '../../../../services';
 import { useAuthz } from '../../../../../../hooks/use_authz';
+import { useAgentVersion } from '../../../../../../hooks/use_agent_version';
 
 import { AgentDetailsActionMenu } from './actions_menu';
 
 jest.mock('../../../../../../services/experimental_features');
 jest.mock('../../../../../../hooks/use_authz');
+jest.mock('../../../../../../hooks/use_agent_version');
 
 const mockedExperimentalFeaturesService = jest.mocked(ExperimentalFeaturesService);
 const mockedUseAuthz = jest.mocked(useAuthz);
+const mockedUseAgentVersion = jest.mocked(useAgentVersion);
 
 function renderActions({ agent, agentPolicy }: { agent: Agent; agentPolicy?: AgentPolicy }) {
   const renderer = createFleetTestRendererMock();
@@ -48,6 +51,7 @@ describe('AgentDetailsActionMenu', () => {
         all: true,
       },
     } as any);
+    mockedUseAgentVersion.mockReturnValue('8.10.2');
   });
 
   describe('Request Diagnotics action', () => {
@@ -162,7 +166,6 @@ describe('AgentDetailsActionMenu', () => {
       expect(res).toBeEnabled();
     });
   });
-});
 
   describe('Restart upgrade action', () => {
     function renderAndGetRestartUpgradeButton({
@@ -204,3 +207,49 @@ describe('Restart upgrade action', () => {
       expect(res).toBe(null);
     });
   });
+
+  describe('Upgrade action', () => {
+    function renderAndGetUpgradeButton({
+      agent,
+      agentPolicy,
+    }: {
+      agent: Agent;
+      agentPolicy?: AgentPolicy;
+    }) {
+      const { utils } = renderActions({
+        agent,
+        agentPolicy,
+      });
+
+      return utils.queryByTestId('upgradeBtn');
+    }
+
+    it('should render an active action button if agent version is not the latest', async () => {
+      const res = renderAndGetUpgradeButton({
+        agent: {
+          active: true,
+          status: 'online',
+          local_metadata: { elastic: { agent: { version: '8.8.0', upgradeable: true } } },
+        } as any,
+        agentPolicy: {} as AgentPolicy,
+      });
+
+      expect(res).not.toBe(null);
+      expect(res).toBeEnabled();
+    });
+
+    it('should render a disabled action button if agent version is latest', async () => {
+      const res = renderAndGetUpgradeButton({
+        agent: {
+          active: true,
+          status: 'online',
+          local_metadata: { elastic: { agent: { version: '8.10.2', upgradeable: true } } },
+        } as any,
+        agentPolicy: {} as AgentPolicy,
+      });
+
+      expect(res).not.toBe(null);
+      expect(res).not.toBeEnabled();
+    });
+  });
+});

x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_details_page/components/actions_menu.tsx

@@ -13,7 +13,7 @@ import { isAgentRequestDiagnosticsSupported } from '../../../../../../../common/
 import { isStuckInUpdating } from '../../../../../../../common/services/agent_status';
 
 import type { Agent, AgentPolicy } from '../../../../types';
-import { useAuthz, useKibanaVersion } from '../../../../hooks';
+import { useAgentVersion, useAuthz } from '../../../../hooks';
 import { ContextMenuActions } from '../../../../components';
 import {
   AgentUnenrollAgentModal,
@@ -34,7 +34,7 @@ export const AgentDetailsActionMenu: React.FunctionComponent<{
   onCancelReassign?: () => void;
 }> = memo(({ agent, assignFlyoutOpenByDefault = false, onCancelReassign, agentPolicy }) => {
   const hasFleetAllPrivileges = useAuthz().fleet.all;
-  const kibanaVersion = useKibanaVersion();
+  const latestAgentVersion = useAgentVersion();
   const refreshAgent = useAgentRefresh();
   const [isReassignFlyoutOpen, setIsReassignFlyoutOpen] = useState(assignFlyoutOpenByDefault);
   const [isUnenrollModalOpen, setIsUnenrollModalOpen] = useState(false);
@@ -102,11 +102,12 @@ export const AgentDetailsActionMenu: React.FunctionComponent<{
       </EuiContextMenuItem>,
       <EuiContextMenuItem
         icon="refresh"
-        disabled={!isAgentUpgradeable(agent, kibanaVersion)}
+        disabled={!!latestAgentVersion && !isAgentUpgradeable(agent, latestAgentVersion)}
         onClick={() => {
           setIsUpgradeModalOpen(true);
         }}
         key="upgradeAgent"
+        data-test-subj="upgradeBtn"
       >
         <FormattedMessage
           id="xpack.fleet.agentList.upgradeOneButton"

x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_details_page/components/agent_details/agent_details_overview.tsx

@@ -22,7 +22,7 @@ import { i18n } from '@kbn/i18n';
 import { FormattedMessage, FormattedRelative } from '@kbn/i18n-react';
 
 import type { Agent, AgentPolicy } from '../../../../../types';
-import { useKibanaVersion } from '../../../../../hooks';
+import { useAgentVersion } from '../../../../../hooks';
 import { ExperimentalFeaturesService, isAgentUpgradeable } from '../../../../../services';
 import { AgentPolicySummaryLine } from '../../../../../components';
 import { AgentHealth } from '../../../components';
@@ -39,7 +39,7 @@ export const AgentDetailsOverviewSection: React.FunctionComponent<{
   agent: Agent;
   agentPolicy?: AgentPolicy;
 }> = memo(({ agent, agentPolicy }) => {
-  const kibanaVersion = useKibanaVersion();
+  const latestAgentVersion = useAgentVersion();
   const { displayAgentMetrics } = ExperimentalFeaturesService.get();
 
   return (
@@ -173,7 +173,7 @@ export const AgentDetailsOverviewSection: React.FunctionComponent<{
                     <EuiFlexItem grow={false} className="eui-textNoWrap">
                       {agent.local_metadata.elastic.agent.version}
                     </EuiFlexItem>
-                    {isAgentUpgradeable(agent, kibanaVersion) ? (
+                    {latestAgentVersion && isAgentUpgradeable(agent, latestAgentVersion) ? (
                       <EuiFlexItem grow={false}>
                         <EuiToolTip
                           position="right"

x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_list_page/components/agent_list_table.tsx

@@ -23,7 +23,8 @@ import { isAgentUpgradeable, ExperimentalFeaturesService } from '../../../../ser
 import { AgentHealth } from '../../components';
 
 import type { Pagination } from '../../../../hooks';
-import { useLink, useKibanaVersion, useAuthz } from '../../../../hooks';
+import { useAgentVersion } from '../../../../hooks';
+import { useLink, useAuthz } from '../../../../hooks';
 
 import { AgentPolicySummaryLine } from '../../../../components';
 import { Tags } from '../../components/tags';
@@ -91,7 +92,7 @@ export const AgentListTable: React.FC<Props> = (props: Props) => {
   const { displayAgentMetrics } = ExperimentalFeaturesService.get();
 
   const { getHref } = useLink();
-  const kibanaVersion = useKibanaVersion();
+  const latestAgentVersion = useAgentVersion();
 
   const isAgentSelectable = (agent: Agent) => {
     if (!agent.active) return false;
@@ -284,7 +285,9 @@ export const AgentListTable: React.FC<Props> = (props: Props) => {
           <EuiFlexItem grow={false} className="eui-textNoWrap">
             {safeMetadata(version)}
           </EuiFlexItem>
-          {isAgentSelectable(agent) && isAgentUpgradeable(agent, kibanaVersion) ? (
+          {isAgentSelectable(agent) &&
+          latestAgentVersion &&
+          isAgentUpgradeable(agent, latestAgentVersion) ? (
             <EuiFlexItem grow={false}>
               <EuiText color="subdued" size="xs" className="eui-textNoWrap">
                 <EuiIcon size="m" type="warning" color="warning" />
@@ -324,7 +327,10 @@ export const AgentListTable: React.FC<Props> = (props: Props) => {
         totalAgents
           ? showUpgradeable
             ? agents.filter(
-                (agent) => isAgentSelectable(agent) && isAgentUpgradeable(agent, kibanaVersion)
+                (agent) =>
+                  isAgentSelectable(agent) &&
+                  latestAgentVersion &&
+                  isAgentUpgradeable(agent, latestAgentVersion)
               )
             : agents
           : []

x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_list_page/components/table_row_actions.test.tsx

@@ -12,14 +12,17 @@ import { createFleetTestRendererMock } from '../../../../../../mock';
 import type { Agent, AgentPolicy } from '../../../../types';
 import { ExperimentalFeaturesService } from '../../../../services';
 import { useAuthz } from '../../../../../../hooks/use_authz';
+import { useAgentVersion } from '../../../../../../hooks/use_agent_version';
 
 import { TableRowActions } from './table_row_actions';
 
 jest.mock('../../../../../../services/experimental_features');
 jest.mock('../../../../../../hooks/use_authz');
+jest.mock('../../../../../../hooks/use_agent_version');
 
 const mockedExperimentalFeaturesService = jest.mocked(ExperimentalFeaturesService);
 const mockedUseAuthz = jest.mocked(useAuthz);
+const mockedUseAgentVersion = jest.mocked(useAgentVersion);
 
 function renderTableRowActions({
   agent,
@@ -57,6 +60,7 @@ describe('TableRowActions', () => {
         all: true,
       },
     } as any);
+    mockedUseAgentVersion.mockReturnValue('8.10.2');
   });
 
   describe('Request Diagnotics action', () => {
@@ -179,4 +183,53 @@ describe('TableRowActions', () => {
       expect(res).toBe(null);
     });
   });
+
+  describe('Upgrade action', () => {
+    function renderAndGetUpgradeButton({
+      agent,
+      agentPolicy,
+    }: {
+      agent: Agent;
+      agentPolicy?: AgentPolicy;
+    }) {
+      const { utils } = renderTableRowActions({
+        agent,
+        agentPolicy,
+      });
+
+      return utils.queryByTestId('upgradeBtn');
+    }
+
+    it('should render an active action button if agent version is not the latest', async () => {
+      const res = renderAndGetUpgradeButton({
+        agent: {
+          active: true,
+          status: 'online',
+          local_metadata: { elastic: { agent: { version: '8.8.0', upgradeable: true } } },
+        } as any,
+        agentPolicy: {
+          is_managed: false,
+        } as AgentPolicy,
+      });
+
+      expect(res).not.toBe(null);
+      expect(res).toBeEnabled();
+    });
+
+    it('should render a disabled action button if agent version is latest', async () => {
+      const res = renderAndGetUpgradeButton({
+        agent: {
+          active: true,
+          status: 'online',
+          local_metadata: { elastic: { agent: { version: '8.10.2', upgradeable: true } } },
+        } as any,
+        agentPolicy: {
+          is_managed: false,
+        } as AgentPolicy,
+      });
+
+      expect(res).not.toBe(null);
+      expect(res).not.toBeEnabled();
+    });
+  });
 });

x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_list_page/components/table_row_actions.tsx

@@ -14,7 +14,7 @@ import { isAgentRequestDiagnosticsSupported } from '../../../../../../../common/
 import { isStuckInUpdating } from '../../../../../../../common/services/agent_status';
 
 import type { Agent, AgentPolicy } from '../../../../types';
-import { useAuthz, useLink, useKibanaVersion } from '../../../../hooks';
+import { useAuthz, useLink, useAgentVersion } from '../../../../hooks';
 import { ContextMenuActions } from '../../../../components';
 import { isAgentUpgradeable } from '../../../../services';
 import { ExperimentalFeaturesService } from '../../../../services';
@@ -42,7 +42,7 @@ export const TableRowActions: React.FunctionComponent<{
   const hasFleetAllPrivileges = useAuthz().fleet.all;
 
   const isUnenrolling = agent.status === 'unenrolling';
-  const kibanaVersion = useKibanaVersion();
+  const latestAgentVersion = useAgentVersion();
   const [isMenuOpen, setIsMenuOpen] = useState(false);
   const { diagnosticFileUploadEnabled, agentTamperProtectionEnabled } =
     ExperimentalFeaturesService.get();
@@ -107,10 +107,11 @@ export const TableRowActions: React.FunctionComponent<{
       <EuiContextMenuItem
         key="agentUpgradeBtn"
         icon="refresh"
-        disabled={!isAgentUpgradeable(agent, kibanaVersion)}
+        disabled={!!latestAgentVersion && !isAgentUpgradeable(agent, latestAgentVersion)}
         onClick={() => {
           onUpgradeClick();
         }}
+        data-test-subj="upgradeBtn"
       >
         <FormattedMessage
           id="xpack.fleet.agentList.upgradeOneButton"

x-pack/plugins/fleet/public/applications/fleet/sections/agents/components/agent_upgrade_modal/index.test.tsx

@@ -21,13 +21,14 @@ jest.mock('../../../../hooks', () => {
     ...jest.requireActual('../../../../hooks'),
     sendGetAgentsAvailableVersions: jest.fn().mockResolvedValue({
       data: {
-        items: ['8.7.0'],
+        items: ['8.10.2', '8.7.0'],
       },
     }),
     sendGetAgentStatus: jest.fn().mockResolvedValue({
       data: { results: { updating: 2 } },
     }),
     sendPostBulkAgentUpgrade: jest.fn(),
+    useAgentVersion: jest.fn().mockReturnValue('8.10.2'),
   };
 });
 
@@ -86,6 +87,18 @@ describe('AgentUpgradeAgentModal', () => {
     });
   });
 
+  it('should default the version combo to latest agent version', async () => {
+    const { utils } = renderAgentUpgradeAgentModal({
+      agents: [{ id: 'agent1', local_metadata: { host: 'abc' } }] as any,
+      agentCount: 1,
+    });
+
+    const el = utils.getByTestId('agentUpgradeModal.VersionCombobox');
+    await waitFor(() => {
+      expect(el.textContent).toEqual('8.10.2');
+    });
+  });
+
   it('should restart uprade on updating agents if some agents in updating', async () => {
     const { utils } = renderAgentUpgradeAgentModal({
       agents: [

x-pack/plugins/fleet/public/applications/fleet/sections/agents/components/agent_upgrade_modal/index.tsx

@@ -41,6 +41,7 @@ import {
   useKibanaVersion,
   useConfig,
   sendGetAgentStatus,
+  useAgentVersion,
 } from '../../../../hooks';
 
 import { sendGetAgentsAvailableVersions } from '../../../../hooks';
@@ -196,6 +197,20 @@ export const AgentUpgradeAgentModal: React.FunctionComponent<AgentUpgradeAgentMo
     },
   ];
   const [selectedVersion, setSelectedVersion] = useState(preselected);
+
+  // latest agent version might be earlier than kibana version
+  const latestAgentVersion = useAgentVersion();
+  useEffect(() => {
+    if (latestAgentVersion) {
+      setSelectedVersion([
+        {
+          label: latestAgentVersion,
+          value: latestAgentVersion,
+        },
+      ]);
+    }
+  }, [latestAgentVersion]);
+
   const [selectedMaintenanceWindow, setSelectedMaintenanceWindow] = useState([
     isSmallBatch ? maintenanceOptions[0] : maintenanceOptions[1],
   ]);

x-pack/plugins/fleet/server/routes/agent/upgrade_handler.ts

@@ -24,6 +24,7 @@ import { getAgentById } from '../../services/agents';
 import type { Agent } from '../../types';
 
 import { getAllFleetServerAgents } from '../../collectors/get_all_fleet_server_agents';
+import { getLatestAvailableVersion } from '../../services/agents/versions';
 
 export const postAgentUpgradeHandler: RequestHandler<
   TypeOf<typeof PostAgentUpgradeRequestSchema.params>,
@@ -35,6 +36,7 @@ export const postAgentUpgradeHandler: RequestHandler<
   const esClient = coreContext.elasticsearch.client.asInternalUser;
   const { version, source_uri: sourceUri, force } = request.body;
   const kibanaVersion = appContextService.getKibanaVersion();
+  const latestAgentVersion = await getLatestAvailableVersion();
   try {
     checkKibanaVersion(version, kibanaVersion, force);
   } catch (err) {
@@ -73,7 +75,7 @@ export const postAgentUpgradeHandler: RequestHandler<
         },
       });
     }
-    if (!force && !isAgentUpgradeable(agent, kibanaVersion, version)) {
+    if (!force && !isAgentUpgradeable(agent, latestAgentVersion, version)) {
       return response.customError({
         statusCode: 400,
         body: {

x-pack/plugins/fleet/server/services/agents/crud.ts

@@ -24,6 +24,7 @@ import { auditLoggingService } from '../audit_logging';
 import { searchHitToAgent, agentSOAttributesToFleetServerAgentDoc } from './helpers';
 
 import { buildAgentStatusRuntimeField } from './build_status_runtime_field';
+import { getLatestAvailableVersion } from './versions';
 
 const INACTIVE_AGENT_CONDITION = `status:inactive OR status:unenrolled`;
 const ACTIVE_AGENT_CONDITION = `NOT (${INACTIVE_AGENT_CONDITION})`;
@@ -302,6 +303,7 @@ export async function getAgentsByKuery(
   // filtering for a range on the version string will not work,
   // nor does filtering on a flattened field (local_metadata), so filter here
   if (showUpgradeable) {
+    const latestAgentVersion = await getLatestAvailableVersion();
     // fixing a bug where upgradeable filter was not returning right results https://github.com/elastic/kibana/issues/117329
     // query all agents, then filter upgradeable, and return the requested page and correct total
     // if there are more than SO_SEARCH_LIMIT agents, the logic falls back to same as before
@@ -309,14 +311,12 @@ export async function getAgentsByKuery(
       const response = await queryAgents(0, SO_SEARCH_LIMIT);
       agents = response.hits.hits
         .map(searchHitToAgent)
-        .filter((agent) => isAgentUpgradeable(agent, appContextService.getKibanaVersion()));
+        .filter((agent) => isAgentUpgradeable(agent, latestAgentVersion));
       total = agents.length;
       const start = (page - 1) * perPage;
       agents = agents.slice(start, start + perPage);
     } else {
-      agents = agents.filter((agent) =>
+      agents = agents.filter((agent) => isAgentUpgradeable(agent, latestAgentVersion));
-        isAgentUpgradeable(agent, appContextService.getKibanaVersion())
-      );
     }
   }
 

x-pack/plugins/fleet/server/services/agents/upgrade_action_runner.ts

@@ -26,6 +26,7 @@ import { createErrorActionResults, createAgentAction } from './actions';
 import { getHostedPolicies, isHostedAgent } from './hosted_agent';
 import { BulkActionTaskType } from './bulk_action_types';
 import { getCancelledActions } from './action_status';
+import { getLatestAvailableVersion } from './versions';
 
 export class UpgradeActionRunner extends ActionRunner {
   protected async processAgents(agents: Agent[]): Promise<{ actionId: string }> {
@@ -72,12 +73,12 @@ export async function upgradeBatch(
       ? givenAgents.filter((agent: Agent) => !isHostedAgent(hostedPolicies, agent))
       : givenAgents;
 
-  const kibanaVersion = appContextService.getKibanaVersion();
+  const latestAgentVersion = await getLatestAvailableVersion();
   const upgradeableResults = await Promise.allSettled(
     agentsToCheckUpgradeable.map(async (agent) => {
       // Filter out agents currently unenrolling, unenrolled, or not upgradeable b/c of version check
       const isNotAllowed =
-        !options.force && !isAgentUpgradeable(agent, kibanaVersion, options.version);
+        !options.force && !isAgentUpgradeable(agent, latestAgentVersion, options.version);
       if (isNotAllowed) {
         throw new FleetError(`Agent ${agent.id} is not upgradeable`);
       }

x-pack/plugins/fleet/server/services/agents/versions.test.ts

@@ -30,7 +30,7 @@ describe('getAvailableVersions', () => {
     mockKibanaVersion = '300.0.0';
     mockedReadFile.mockResolvedValue(`["8.1.0", "8.0.0", "7.17.0", "7.16.0"]`);
 
-    const res = await getAvailableVersions({ cached: false });
+    const res = await getAvailableVersions({ cached: false, includeCurrentVersion: true });
 
     expect(res).toEqual(['300.0.0', '8.1.0', '8.0.0', '7.17.0']);
   });
@@ -39,11 +39,11 @@ describe('getAvailableVersions', () => {
     mockKibanaVersion = '300.0.0-SNAPSHOT';
     mockedReadFile.mockResolvedValue(`["8.1.0", "8.0.0", "7.17.0", "7.16.0"]`);
 
-    const res = await getAvailableVersions({ cached: false });
+    const res = await getAvailableVersions({ cached: false, includeCurrentVersion: true });
     expect(res).toEqual(['300.0.0-SNAPSHOT', '8.1.0', '8.0.0', '7.17.0']);
   });
 
-  it('should not include the current version if onlyAllowAgentUpgradeToKnownVersions = true', async () => {
+  it('should not include the current version if includeCurrentVersion is not set', async () => {
     mockKibanaVersion = '300.0.0-SNAPSHOT';
     mockConfig = {
       internal: {
@@ -65,4 +65,18 @@ describe('getAvailableVersions', () => {
 
     expect(res).toEqual(['8.1.0', '8.0.0', '7.17.0']);
   });
+
+  it('should return kibana version only if cannot read versions', async () => {
+    mockKibanaVersion = '300.0.0';
+    mockConfig = {
+      internal: {
+        onlyAllowAgentUpgradeToKnownVersions: false,
+      },
+    };
+    mockedReadFile.mockRejectedValue({ code: 'ENOENT' });
+
+    const res = await getAvailableVersions({ cached: false });
+
+    expect(res).toEqual(['300.0.0']);
+  });
 });

x-pack/plugins/fleet/server/services/agents/versions.ts

@@ -60,8 +60,7 @@ export const getAvailableVersions = async ({
       .sort((a: any, b: any) => (semverGt(a, b) ? -1 : 1));
     versionsToDisplay = uniq(versions) as string[];
 
-    const appendCurrentVersion =
+    const appendCurrentVersion = includeCurrentVersion;
-      includeCurrentVersion ?? !config?.internal?.onlyAllowAgentUpgradeToKnownVersions;
 
     if (appendCurrentVersion) {
       // Add current version if not already present