[ObsUX][Infra] Move getServices to apm_data_access plugin (#192565)

Closes #190338

### What was done

- Creates a service in `apm_data_access` that returns services for a
specific host
- Remove all getServices() from infra plugin

#### How to test

In Infrastructure/Hosts, filter by `service.name: *`, when clicking on
one of the hosts we expect to see in the host details, and also the
flyout, a list of services with their proper agent icon

<img width="1041" alt="image"
src="https://github.com/user-attachments/assets/6fbd0b67-4345-48e7-9ad4-5a354218246a">

x-pack/plugins/observability_solution/apm_data_access/server/services/get_host_services/index.ts

@@ -0,0 +1,185 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { rangeQuery, termQuery } from '@kbn/observability-plugin/server';
+import {
+  AGENT_NAME,
+  HOST_HOSTNAME,
+  HOST_NAME,
+  METRICSET_NAME,
+  SERVICE_NAME,
+} from '@kbn/apm-types/es_fields';
+import { QueryDslQueryContainer } from '@elastic/elasticsearch/lib/api/typesWithBodyKey';
+import {
+  RollupInterval,
+  TimeRangeMetadata,
+  getBucketSize,
+  getPreferredBucketSizeAndDataSource,
+} from '../../../common';
+import { ApmDocumentType } from '../../../common/document_type';
+import type { ApmDataAccessServicesParams } from '../get_services';
+
+const MAX_SIZE = 1000;
+
+export interface HostServicesRequest {
+  filters: Record<string, string>;
+  start: number;
+  end: number;
+  size?: number;
+  documentSources: TimeRangeMetadata['sources'];
+}
+
+const suitableTypes = [ApmDocumentType.TransactionMetric, ApmDocumentType.ErrorEvent];
+
+export function createGetHostServices({ apmEventClient }: ApmDataAccessServicesParams) {
+  return async ({ start, end, size = MAX_SIZE, filters, documentSources }: HostServicesRequest) => {
+    const sourcesToUse = getPreferredBucketSizeAndDataSource({
+      sources: documentSources.filter((s) => suitableTypes.includes(s.documentType)),
+      bucketSizeInSeconds: getBucketSize({ start, end, numBuckets: 50 }).bucketSize,
+    });
+
+    const commonFiltersList: QueryDslQueryContainer[] = [
+      ...rangeQuery(start, end),
+      {
+        exists: {
+          field: SERVICE_NAME,
+        },
+      },
+    ];
+
+    if (filters[HOST_NAME]) {
+      commonFiltersList.push({
+        bool: {
+          should: [
+            ...termQuery(HOST_NAME, filters[HOST_NAME]),
+            ...termQuery(HOST_HOSTNAME, filters[HOST_HOSTNAME]),
+          ],
+          minimum_should_match: 1,
+        },
+      });
+    }
+    // get services from transaction metrics
+    const metricsQuery = await apmEventClient.search('get_apm_host_services_from_metrics', {
+      apm: {
+        sources: [
+          {
+            documentType: ApmDocumentType.TransactionMetric,
+            rollupInterval: RollupInterval.OneMinute,
+          },
+        ],
+      },
+      body: {
+        track_total_hits: false,
+        size: 0,
+        query: {
+          bool: {
+            filter: [
+              {
+                bool: {
+                  should: [
+                    ...termQuery(METRICSET_NAME, 'app'),
+                    {
+                      bool: {
+                        must: [...termQuery(METRICSET_NAME, 'transaction')],
+                      },
+                    },
+                  ],
+                  minimum_should_match: 1,
+                },
+              },
+              ...commonFiltersList,
+            ],
+          },
+        },
+        aggs: {
+          services: {
+            terms: {
+              field: SERVICE_NAME,
+              size,
+            },
+            aggs: {
+              latestAgent: {
+                top_metrics: {
+                  metrics: [{ field: AGENT_NAME }],
+                  sort: {
+                    '@timestamp': 'desc',
+                  },
+                  size: 1,
+                },
+              },
+            },
+          },
+        },
+      },
+    });
+
+    // get services from logs
+    const logsQuery = await apmEventClient.search('get_apm_host_services_from_logs', {
+      apm: {
+        sources: [
+          {
+            documentType: ApmDocumentType.ErrorEvent,
+            rollupInterval: sourcesToUse.source.rollupInterval,
+          },
+        ],
+      },
+      body: {
+        track_total_hits: false,
+        size: 0,
+        query: {
+          bool: {
+            filter: commonFiltersList,
+          },
+        },
+        aggs: {
+          services: {
+            terms: {
+              field: SERVICE_NAME,
+              size,
+            },
+            aggs: {
+              latestAgent: {
+                top_metrics: {
+                  metrics: [{ field: AGENT_NAME }],
+                  sort: {
+                    '@timestamp': 'desc',
+                  },
+                  size: 1,
+                },
+              },
+            },
+          },
+        },
+      },
+    });
+
+    const servicesListBucketsFromMetrics = metricsQuery.aggregations?.services.buckets || [];
+    const servicesListBucketsFromLogs = logsQuery.aggregations?.services.buckets || [];
+    const serviceMap = [...servicesListBucketsFromMetrics, ...servicesListBucketsFromLogs].reduce(
+      (acc, bucket) => {
+        const serviceName = bucket.key as string;
+        const latestAgentEntry = bucket.latestAgent.top[0];
+        const latestTimestamp = latestAgentEntry.sort[0] as string;
+        const agentName = latestAgentEntry.metrics[AGENT_NAME] as string | null;
+        // dedup and get the latest timestamp
+        const existingService = acc.get(serviceName);
+        if (!existingService || existingService.latestTimestamp < latestTimestamp) {
+          acc.set(serviceName, { latestTimestamp, agentName });
+        }
+        return acc;
+      },
+      new Map<string, { latestTimestamp: string; agentName: string | null }>()
+    );
+    const services = Array.from(serviceMap)
+      .slice(0, size)
+      .map(([serviceName, { agentName }]) => ({
+        serviceName,
+        agentName,
+      }));
+    return { services };
+  };
+}

x-pack/plugins/observability_solution/apm_data_access/server/services/get_services.ts

@@ -9,6 +9,7 @@ import { APMEventClient } from '../lib/helpers/create_es_client/create_apm_event
 import { createGetDocumentSources } from './get_document_sources';
 import { getDocumentTypeConfig } from './get_document_type_config';
 import { createGetHostNames } from './get_host_names';
+import { createGetHostServices } from './get_host_services';
 
 export interface ApmDataAccessServicesParams {
   apmEventClient: APMEventClient;
@@ -19,5 +20,6 @@ export function getServices(params: ApmDataAccessServicesParams) {
     getDocumentSources: createGetDocumentSources(params),
     getHostNames: createGetHostNames(params),
     getDocumentTypeConfig,
+    getHostServices: createGetHostServices(params),
   };
 }

x-pack/plugins/observability_solution/infra/common/http_api/host_details/get_infra_services.ts

@@ -8,16 +8,14 @@
 import {
   createLiteralValueFromUndefinedRT,
   inRangeFromStringRt,
-  dateRt,
-  datemathStringRt,
+  isoToEpochRt,
 } from '@kbn/io-ts-utils';
 import * as rt from 'io-ts';
 
 export const sizeRT = rt.union([
   inRangeFromStringRt(1, 100),
   createLiteralValueFromUndefinedRT(10),
 ]);
-export const assetDateRT = rt.union([dateRt, datemathStringRt]);
 
 export const servicesFiltersRT = rt.strict({
   ['host.name']: rt.string,
@@ -26,7 +24,7 @@ export const servicesFiltersRT = rt.strict({
 export type ServicesFilter = rt.TypeOf<typeof servicesFiltersRT>;
 
 export const GetServicesRequestQueryRT = rt.intersection([
-  rt.strict({ from: assetDateRT, to: assetDateRT, filters: rt.string }),
+  rt.strict({ from: isoToEpochRt, to: isoToEpochRt, filters: rt.string }),
   rt.partial({
     size: sizeRT,
     validatedFilters: servicesFiltersRT,
@@ -37,8 +35,8 @@ export type GetServicesRequestQuery = rt.TypeOf<typeof GetServicesRequestQueryRT
 
 export interface ServicesAPIRequest {
   filters: ServicesFilter;
-  from: string;
-  to: string;
+  from: number;
+  to: number;
   size?: number;
 }