[Fleet] Only show agent dashboard links if there is more than one non-server agent and if the dashboards exist (#164469)

## Summary

Closes #161827

These buttons were showing in cloud when there was only the cloud agent
added:

<img width="647" alt="Screenshot 2023-08-22 at 16 18 51"
src="baaff9b9-17fc-49b5-bad9-980f91a5ae15">

The ingest dashboard links will now only show if:

- the user has one agent that is not part of a policy containing fleet
server (I have re-used an existing hook we have to check this here)
- the agent ingest metrics dashaboard exists in the current space

Test Scenarios

1. Setup fleet with ONLY a fleet server connected, the dashboard links
should not show
2. Setup fleet with fleet server and another non-fleet server agent, the
dashboard links should show
3. With the same setup as test case 2, now create another space, visit
fleet in the new space, the links should not show as the dashboards are
not installed in the current space.


### Checklist

Delete any items that are not applicable to this PR.

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [x] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [x] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [x] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [x] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/fleet/.storybook/context/index.tsx

@@ -16,6 +16,8 @@ import { I18nProvider } from '@kbn/i18n-react';
 import { CoreScopedHistory } from '@kbn/core/public';
 import { getStorybookContextProvider } from '@kbn/custom-integrations-plugin/storybook';
 
+import type { DashboardStart } from '@kbn/dashboard-plugin/public';
+
 import { IntegrationsAppContext } from '../../public/applications/integrations/app';
 import type { FleetConfigType, FleetStartServices } from '../../public/plugin';
 import { ExperimentalFeaturesService } from '../../public/services';
@@ -76,6 +78,7 @@ export const StorybookContext: React.FC<{ storyContext?: Parameters<DecoratorFn>
         languageClientsUiComponents: {},
       },
       customBranding: getCustomBranding(),
+      dashboard: {} as unknown as DashboardStart,
       docLinks: getDocLinks(),
       http: getHttp(),
       i18n: {

x-pack/plugins/fleet/kibana.jsonc

@@ -23,7 +23,8 @@
       "taskManager",
       "guidedOnboarding",
       "files",
-      "uiActions"
+      "uiActions",
+      "dashboard"
     ],
     "optionalPlugins": [
       "features",

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

@@ -5,13 +5,37 @@
  * 2.0.
  */
 
-import React from 'react';
+import React, { useEffect } from 'react';
 import { EuiFlexGroup, EuiFlexItem, EuiButtonEmpty } from '@elastic/eui';
 import { FormattedMessage } from '@kbn/i18n-react';
 
 import { DASHBOARD_LOCATORS_IDS } from '../../../../../../../common/constants';
 
-import { useDashboardLocator } from '../../../../hooks';
+import { useDashboardLocator, useStartServices } from '../../../../hooks';
+
+const useDashboardExists = (dashboardId: string) => {
+  const [dashboardExists, setDashboardExists] = React.useState<boolean>(false);
+  const [loading, setLoading] = React.useState<boolean>(true);
+  const { dashboard: dashboardPlugin } = useStartServices();
+
+  useEffect(() => {
+    const fetchDashboard = async () => {
+      try {
+        const findDashboardsService = await dashboardPlugin.findDashboardsService();
+        const [dashboard] = await findDashboardsService.findByIds([dashboardId]);
+        setLoading(false);
+        setDashboardExists(dashboard?.status === 'success');
+      } catch (e) {
+        setLoading(false);
+        setDashboardExists(false);
+      }
+    };
+
+    fetchDashboard();
+  }, [dashboardId, dashboardPlugin]);
+
+  return { dashboardExists, loading };
+};
 
 export const DashboardsButtons: React.FunctionComponent = () => {
   const dashboardLocator = useDashboardLocator();
@@ -20,6 +44,14 @@ export const DashboardsButtons: React.FunctionComponent = () => {
     return dashboardLocator?.getRedirectUrl({ dashboardId }) || '';
   };
 
+  const { dashboardExists, loading: dashboardLoading } = useDashboardExists(
+    DASHBOARD_LOCATORS_IDS.ELASTIC_AGENT_OVERVIEW
+  );
+
+  if (dashboardLoading || !dashboardExists) {
+    return null;
+  }
+
   return (
     <>
       <EuiFlexGroup gutterSize="s" justifyContent="flexStart">

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

@@ -22,6 +22,8 @@ import {
 import { FormattedMessage } from '@kbn/i18n-react';
 import styled from 'styled-components';
 
+import { useIsFirstTimeAgentUserQuery } from '../../../../../integrations/sections/epm/screens/detail/hooks';
+
 import type { Agent, AgentPolicy } from '../../../../types';
 import { SearchBar } from '../../../../components';
 import { AGENTS_INDEX, AGENTS_PREFIX } from '../../../../constants';
@@ -94,6 +96,8 @@ export const SearchAndFilterBar: React.FunctionComponent<SearchAndFilterBarProps
 }) => {
   const { euiTheme } = useEuiTheme();
   const { isFleetServerStandalone } = useFleetServerStandalone();
+  const { isFirstTimeAgentUser, isLoading: isFirstTimeAgentUserLoading } =
+    useIsFirstTimeAgentUserQuery();
   const showAddFleetServerBtn = !isFleetServerStandalone;
 
   // Policies state for filtering
@@ -126,7 +130,9 @@ export const SearchAndFilterBar: React.FunctionComponent<SearchAndFilterBarProps
       <EuiFlexGroup direction="column">
         {/* Top Buttons and Links */}
         <EuiFlexGroup>
-          <EuiFlexItem>{totalAgents > 0 && <DashboardsButtons />}</EuiFlexItem>
+          <EuiFlexItem>
+            {!isFirstTimeAgentUserLoading && !isFirstTimeAgentUser && <DashboardsButtons />}
+          </EuiFlexItem>
           <EuiFlexGroup gutterSize="s" justifyContent="flexEnd">
             <EuiFlexItem grow={false}>
               <AgentActivityButton

x-pack/plugins/fleet/public/mock/fleet_start_services.tsx

@@ -90,6 +90,7 @@ export const createStartServices = (basePath: string = '/mock'): MockedFleetStar
       ...cloudStart,
       ...cloudSetup,
     },
+    dashboard: {} as unknown as MockedFleetStartServices['dashboard'],
     storage: new Storage(createMockStore()) as jest.Mocked<Storage>,
     authz: fleetAuthzMock,
     guidedOnboarding: guidedOnboardingMock.createStart(),

x-pack/plugins/fleet/public/plugin.ts

@@ -49,6 +49,8 @@ import type { SendRequestResponse } from '@kbn/es-ui-shared-plugin/public';
 import type { UnifiedSearchPublicPluginStart } from '@kbn/unified-search-plugin/public';
 import type { GuidedOnboardingPluginStart } from '@kbn/guided-onboarding-plugin/public';
 
+import type { DashboardStart } from '@kbn/dashboard-plugin/public';
+
 import { PLUGIN_ID, INTEGRATIONS_PLUGIN_ID, setupRouteService, appRoutesService } from '../common';
 import { calculateAuthz, calculatePackagePrivilegesFromCapabilities } from '../common/authz';
 import { parseExperimentalConfigValue } from '../common/experimental_features';
@@ -115,6 +117,7 @@ export interface FleetSetupDeps {
 export interface FleetStartDeps {
   licensing: LicensingPluginStart;
   data: DataPublicPluginStart;
+  dashboard: DashboardStart;
   dataViews: DataViewsPublicPluginStart;
   unifiedSearch: UnifiedSearchPublicPluginStart;
   navigation: NavigationPublicPluginStart;
@@ -128,6 +131,7 @@ export interface FleetStartDeps {
 export interface FleetStartServices extends CoreStart, Exclude<FleetStartDeps, 'cloud'> {
   storage: Storage;
   share: SharePluginStart;
+  dashboard: DashboardStart;
   cloud?: CloudSetup & CloudStart;
   discover?: DiscoverStart;
   spaces?: SpacesPluginStart;

x-pack/plugins/fleet/tsconfig.json

@@ -100,5 +100,6 @@
     "@kbn/core-http-router-server-mocks",
     "@kbn/core-application-browser",
     "@kbn/core-saved-objects-base-server-internal",
+    "@kbn/dashboard-plugin",
   ]
 }