[APM] use latency sum instead of avg for impact (#89990) (#90019)

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

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

Author: dgieselaar

x-pack/plugins/apm/server/lib/services/get_service_dependencies/index.ts

@@ -196,19 +196,26 @@ export async function getServiceDependencies({
   });
 
   const latencySums = metricsByResolvedAddress
-    .map((metrics) => metrics.latency.value)
+    .map(
+      (metric) => (metric.latency.value ?? 0) * (metric.throughput.value ?? 0)
+    )
     .filter(isFiniteNumber);
 
   const minLatencySum = Math.min(...latencySums);
   const maxLatencySum = Math.max(...latencySums);
 
-  return metricsByResolvedAddress.map((metric) => ({
-    ...metric,
-    impact:
-      metric.latency.value === null
-        ? 0
-        : ((metric.latency.value - minLatencySum) /
+  return metricsByResolvedAddress.map((metric) => {
+    const impact =
+      isFiniteNumber(metric.latency.value) &&
+      isFiniteNumber(metric.throughput.value)
+        ? ((metric.latency.value * metric.throughput.value - minLatencySum) /
             (maxLatencySum - minLatencySum)) *
-          100,
-  }));
+          100
+        : 0;
+
+    return {
+      ...metric,
+      impact,
+    };
+  });
 }

x-pack/test/apm_api_integration/tests/service_overview/dependencies/index.ts

@@ -6,7 +6,7 @@
 
 import expect from '@kbn/expect';
 import url from 'url';
-import { sortBy, pick, last } from 'lodash';
+import { sortBy, pick, last, omit } from 'lodash';
 import { ValuesType } from 'utility-types';
 import { registry } from '../../../common/registry';
 import { Maybe } from '../../../../../plugins/apm/typings/common';
@@ -306,7 +306,7 @@ export default function ApiTest({ getService }: FtrProviderContext) {
       before(async () => {
         response = await supertest.get(
           url.format({
-            pathname: `/api/apm/services/opbeans-java/dependencies`,
+            pathname: `/api/apm/services/opbeans-python/dependencies`,
             query: {
               start,
               end,
@@ -323,14 +323,41 @@ export default function ApiTest({ getService }: FtrProviderContext) {
 
       it('returns at least one item', () => {
         expect(response.body.length).to.be.greaterThan(0);
+
+        expectSnapshot(
+          omit(response.body[0], [
+            'errorRate.timeseries',
+            'throughput.timeseries',
+            'latency.timeseries',
+          ])
+        ).toMatchInline(`
+          Object {
+            "errorRate": Object {
+              "value": 0,
+            },
+            "impact": 1.97910470896139,
+            "latency": Object {
+              "value": 1043.99015586546,
+            },
+            "name": "redis",
+            "spanSubtype": "redis",
+            "spanType": "db",
+            "throughput": Object {
+              "value": 40.6333333333333,
+            },
+            "type": "external",
+          }
+        `);
       });
 
       it('returns the right names', () => {
         const names = response.body.map((item) => item.name);
         expectSnapshot(names.sort()).toMatchInline(`
           Array [
-            "opbeans-go",
+            "elasticsearch",
+            "opbeans-java",
             "postgresql",
+            "redis",
           ]
         `);
       });
@@ -342,7 +369,7 @@ export default function ApiTest({ getService }: FtrProviderContext) {
 
         expectSnapshot(serviceNames.sort()).toMatchInline(`
           Array [
-            "opbeans-go",
+            "opbeans-java",
           ]
         `);
       });
@@ -356,32 +383,89 @@ export default function ApiTest({ getService }: FtrProviderContext) {
         expectSnapshot(latencyValues).toMatchInline(`
           Array [
             Object {
-              "latency": 38506.4285714286,
-              "name": "opbeans-go",
+              "latency": 2568.40816326531,
+              "name": "elasticsearch",
+            },
+            Object {
+              "latency": 25593.875,
+              "name": "opbeans-java",
             },
             Object {
-              "latency": 5908.77272727273,
+              "latency": 28885.3293963255,
               "name": "postgresql",
             },
+            Object {
+              "latency": 1043.99015586546,
+              "name": "redis",
+            },
           ]
         `);
       });
 
       it('returns the right throughput values', () => {
         const throughputValues = sortBy(
-          response.body.map((item) => ({ name: item.name, latency: item.throughput.value })),
+          response.body.map((item) => ({ name: item.name, throughput: item.throughput.value })),
           'name'
         );
 
         expectSnapshot(throughputValues).toMatchInline(`
           Array [
             Object {
-              "latency": 0.466666666666667,
-              "name": "opbeans-go",
+              "name": "elasticsearch",
+              "throughput": 13.0666666666667,
+            },
+            Object {
+              "name": "opbeans-java",
+              "throughput": 0.533333333333333,
             },
             Object {
-              "latency": 3.66666666666667,
               "name": "postgresql",
+              "throughput": 50.8,
+            },
+            Object {
+              "name": "redis",
+              "throughput": 40.6333333333333,
+            },
+          ]
+        `);
+      });
+
+      it('returns the right impact values', () => {
+        const impactValues = sortBy(
+          response.body.map((item) => ({
+            name: item.name,
+            impact: item.impact,
+            latency: item.latency.value,
+            throughput: item.throughput.value,
+          })),
+          'name'
+        );
+
+        expectSnapshot(impactValues).toMatchInline(`
+          Array [
+            Object {
+              "impact": 1.36961744704522,
+              "latency": 2568.40816326531,
+              "name": "elasticsearch",
+              "throughput": 13.0666666666667,
+            },
+            Object {
+              "impact": 0,
+              "latency": 25593.875,
+              "name": "opbeans-java",
+              "throughput": 0.533333333333333,
+            },
+            Object {
+              "impact": 100,
+              "latency": 28885.3293963255,
+              "name": "postgresql",
+              "throughput": 50.8,
+            },
+            Object {
+              "impact": 1.97910470896139,
+              "latency": 1043.99015586546,
+              "name": "redis",
+              "throughput": 40.6333333333333,
             },
           ]
         `);