[8.6] changed agent versions to agents per version telemetry (#147164) (#147169)

# Backport

This will backport the following commits from `main` to `8.6`:
- [changed agent versions to agents per version telemetry
(#147164)](https://github.com/elastic/kibana/pull/147164)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Julia
Bardi","email":"90178898+juliaElastic@users.noreply.github.com"},"sourceCommit":{"committedDate":"2022-12-07T11:23:30Z","message":"changed
agent versions to agents per version telemetry (#147164)\n\n##
Summary\r\n\r\nChanged the list of agent versions to agent count per
version in\r\nfleet-usages telemetry as
requested\r\n[here](https://github.com/elastic/kibana/pull/145353#issuecomment-1331783758).\r\n\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common
scenarios","sha":"e771fc8e9fa5f551d8692fc8558e5d7e2cbfef79","branchLabelMapping":{"^v8.7.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","Team:Fleet","v8.7.0","v8.6.1"],"number":147164,"url":"https://github.com/elastic/kibana/pull/147164","mergeCommit":{"message":"changed
agent versions to agents per version telemetry (#147164)\n\n##
Summary\r\n\r\nChanged the list of agent versions to agent count per
version in\r\nfleet-usages telemetry as
requested\r\n[here](https://github.com/elastic/kibana/pull/145353#issuecomment-1331783758).\r\n\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common
scenarios","sha":"e771fc8e9fa5f551d8692fc8558e5d7e2cbfef79"}},"sourceBranch":"main","suggestedTargetBranches":["8.6"],"targetPullRequestStates":[{"branch":"main","label":"v8.7.0","labelRegex":"^v8.7.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/147164","number":147164,"mergeCommit":{"message":"changed
agent versions to agents per version telemetry (#147164)\n\n##
Summary\r\n\r\nChanged the list of agent versions to agent count per
version in\r\nfleet-usages telemetry as
requested\r\n[here](https://github.com/elastic/kibana/pull/145353#issuecomment-1331783758).\r\n\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common
scenarios","sha":"e771fc8e9fa5f551d8692fc8558e5d7e2cbfef79"}},{"branch":"8.6","label":"v8.6.1","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Julia Bardi <90178898+juliaElastic@users.noreply.github.com>
Co-authored-by: Julia Bardi <julia.bardi@elastic.co>

x-pack/plugins/fleet/cypress/e2e/integrations_real.cy.ts

@@ -174,10 +174,10 @@ describe('Add Integration - Real API', () => {
     setupIntegrations();
     cy.getBySel(getIntegrationCategories('aws')).click();
     cy.getBySel(INTEGRATIONS_SEARCHBAR.BADGE).contains('AWS').should('exist');
-    cy.getBySel(INTEGRATION_LIST).find('.euiCard').should('have.length', 28);
+    cy.getBySel(INTEGRATION_LIST).find('.euiCard').should('have.length.greaterThan', 28);
 
     cy.getBySel(INTEGRATIONS_SEARCHBAR.INPUT).clear().type('Cloud');
-    cy.getBySel(INTEGRATION_LIST).find('.euiCard').should('have.length', 3);
+    cy.getBySel(INTEGRATION_LIST).find('.euiCard').should('have.length.greaterThan', 2);
     cy.getBySel(INTEGRATIONS_SEARCHBAR.REMOVE_BADGE_BUTTON).click();
     cy.getBySel(INTEGRATIONS_SEARCHBAR.BADGE).should('not.exist');
   });

x-pack/plugins/fleet/server/collectors/agent_collectors.ts

@@ -49,7 +49,10 @@ export const getAgentUsage = async (
 };
 
 export interface AgentData {
-  agent_versions: string[];
+  agents_per_version: Array<{
+    version: string;
+    count: number;
+  }>;
   agent_checkin_status: {
     error: number;
     degraded: number;
@@ -58,9 +61,9 @@ export interface AgentData {
 }
 
 const DEFAULT_AGENT_DATA = {
-  agent_versions: [],
   agent_checkin_status: { error: 0, degraded: 0 },
   agents_per_policy: [],
+  agents_per_version: [],
 };
 
 export const getAgentData = async (
@@ -105,8 +108,8 @@ export const getAgentData = async (
       },
       { signal: abortController.signal }
     );
-    const versions = ((response?.aggregations?.versions as any).buckets ?? []).map(
-      (bucket: any) => bucket.key
+    const agentsPerVersion = ((response?.aggregations?.versions as any).buckets ?? []).map(
+      (bucket: any) => ({ version: bucket.key, count: bucket.doc_count })
     );
     const statuses = transformLastCheckinStatusBuckets(response);
 
@@ -115,9 +118,9 @@ export const getAgentData = async (
     );
 
     return {
-      agent_versions: versions,
       agent_checkin_status: statuses,
       agents_per_policy: agentsPerPolicy,
+      agents_per_version: agentsPerVersion,
     };
   } catch (error) {
     if (error.statusCode === 404) {

x-pack/plugins/fleet/server/integration_tests/fleet_usage_telemetry.test.ts

@@ -260,7 +260,10 @@ describe('fleet usage telemetry', () => {
           num_host_urls: 0,
         },
         packages: [],
-        agent_versions: ['8.5.1', '8.6.0'],
+        agents_per_version: [
+          { version: '8.5.1', count: 1 },
+          { version: '8.6.0', count: 1 },
+        ],
         agent_checkin_status: { error: 1, degraded: 1 },
         agents_per_policy: [2],
         fleet_server_config: {

x-pack/plugins/fleet/server/services/telemetry/fleet_usages_schema.ts

@@ -106,11 +106,13 @@ export const fleetUsagesSchema: RootSchema<any> = {
       },
     },
   },
-  agent_versions: {
+  agents_per_version: {
     type: 'array',
     items: {
-      type: 'keyword',
-      _meta: { description: 'The agent versions enrolled in this deployment.' },
+      properties: {
+        version: { type: 'keyword' },
+        count: { type: 'long' },
+      },
     },
   },
   agents_per_policy: {