[Infrastructure UI] Remove sensitive info from telemetry payload (#159314)

## Summary

This PR changes the `Hosts View Query Submitted` telemetry event
payload, stopping Kibana from sending potentially sensitive information
to analytics services.

An example of the new payload:

```ts
{
  control_filter_fields: ['host.os.name'],
  filter_fields: ['host.name', 'cloud.provider'],
  interval: 'interval(now-1h)',
  with_query: false,
  limit: 100,
}
```

Instead of sending filter values, we'll pass only the field names.
Except for the query bar, because it's to complicated to parse and
retrieve that information

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

x-pack/plugins/infra/public/pages/metrics/hosts/hooks/use_unified_search.ts

@@ -22,6 +22,7 @@ import {
   type HostsState,
   type StringDateRangeTimestamp,
 } from './use_unified_search_url_state';
+import { retrieveFieldsFromFilter } from '../utils';
 
 const buildQuerySubmittedPayload = (
   hostState: HostsState & { parsedDateRange: StringDateRangeTimestamp }
@@ -29,10 +30,10 @@ const buildQuerySubmittedPayload = (
   const { panelFilters, filters, parsedDateRange, query: queryObj, limit } = hostState;
 
   return {
-    control_filters: panelFilters.map((filter) => JSON.stringify(filter)),
-    filters: filters.map((filter) => JSON.stringify(filter)),
+    control_filter_fields: retrieveFieldsFromFilter(panelFilters),
+    filter_fields: retrieveFieldsFromFilter(filters),
     interval: telemetryTimeRangeFormatter(parsedDateRange.to - parsedDateRange.from),
-    query: queryObj.query,
+    with_query: !!queryObj.query,
     limit,
   };
 };

x-pack/plugins/infra/public/pages/metrics/hosts/utils.ts

@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { DataViewBase, Filter } from '@kbn/es-query';
+import { DataViewBase, Filter, isCombinedFilter } from '@kbn/es-query';
 
 export const createHostsFilter = (hostNames: string[], dataView?: DataViewBase): Filter => {
   return {
@@ -25,3 +25,17 @@ export const createHostsFilter = (hostNames: string[], dataView?: DataViewBase):
       : {},
   };
 };
+
+export const retrieveFieldsFromFilter = (filters: Filter[], fields: string[] = []) => {
+  for (const filter of filters) {
+    if (isCombinedFilter(filter)) {
+      retrieveFieldsFromFilter(filter.meta.params, fields);
+    }
+
+    if (filter.meta.key) {
+      fields.push(filter.meta.key);
+    }
+  }
+
+  return fields;
+};

x-pack/plugins/infra/public/services/telemetry/telemetry_events.ts

@@ -9,7 +9,7 @@ import { InfraTelemetryEventTypes, InfraTelemetryEvent } from './types';
 const hostsViewQuerySubmittedEvent: InfraTelemetryEvent = {
   eventType: InfraTelemetryEventTypes.HOSTS_VIEW_QUERY_SUBMITTED,
   schema: {
-    control_filters: {
+    control_filter_fields: {
       type: 'array',
       items: {
         type: 'text',
@@ -19,7 +19,7 @@ const hostsViewQuerySubmittedEvent: InfraTelemetryEvent = {
         },
       },
     },
-    filters: {
+    filter_fields: {
       type: 'array',
       items: {
         type: 'text',
@@ -36,8 +36,8 @@ const hostsViewQuerySubmittedEvent: InfraTelemetryEvent = {
         optional: false,
       },
     },
-    query: {
-      type: 'text',
+    with_query: {
+      type: 'boolean',
       _meta: {
         description: 'KQL query search for hosts',
         optional: false,

x-pack/plugins/infra/public/services/telemetry/telemetry_service.test.ts

@@ -103,10 +103,10 @@ describe('TelemetryService', () => {
       const telemetry = service.start();
 
       telemetry.reportHostsViewQuerySubmitted({
-        control_filters: ['test-filter'],
-        filters: [],
+        control_filter_fields: ['host.os.name'],
+        filter_fields: [],
         interval: 'interval(now-1h)',
-        query: '',
+        with_query: false,
         limit: 100,
       });
 
@@ -114,10 +114,10 @@ describe('TelemetryService', () => {
       expect(setupParams.analytics.reportEvent).toHaveBeenCalledWith(
         InfraTelemetryEventTypes.HOSTS_VIEW_QUERY_SUBMITTED,
         {
-          control_filters: ['test-filter'],
-          filters: [],
+          control_filter_fields: ['host.os.name'],
+          filter_fields: [],
           interval: 'interval(now-1h)',
-          query: '',
+          with_query: false,
           limit: 100,
         }
       );

x-pack/plugins/infra/public/services/telemetry/types.ts

@@ -21,10 +21,10 @@ export enum InfraTelemetryEventTypes {
 }
 
 export interface HostsViewQuerySubmittedParams {
-  control_filters: string[];
-  filters: string[];
+  control_filter_fields: string[];
+  filter_fields: string[];
   interval: string;
-  query: string | { [key: string]: any };
+  with_query: boolean;
   limit: number;
 }