[APM] Use the outcome field to calculate the transaction error rate chart

x-pack/plugins/apm/common/elasticsearch_fieldnames.ts

@@ -45,6 +45,8 @@ export const TRANSACTION_SAMPLED = 'transaction.sampled';
 export const TRANSACTION_BREAKDOWN_COUNT = 'transaction.breakdown.count';
 export const TRANSACTION_PAGE_URL = 'transaction.page.url';
 
+export const EVENT_OUTCOME = 'event.outcome';
+
 export const TRACE_ID = 'trace.id';
 
 export const SPAN_DURATION = 'span.duration.us';

x-pack/plugins/apm/common/event_outcome.ts

@@ -0,0 +1,11 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+export enum EventOutcome {
+  success = 'success',
+  failure = 'failure',
+  unknown = 'unknown',
+}

x-pack/plugins/apm/server/lib/transaction_groups/get_error_rate.ts

@@ -4,11 +4,12 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 import { mean } from 'lodash';
+import { EventOutcome } from '../../../common/event_outcome';
 import {
-  HTTP_RESPONSE_STATUS_CODE,
   TRANSACTION_NAME,
   TRANSACTION_TYPE,
   SERVICE_NAME,
+  EVENT_OUTCOME,
 } from '../../../common/elasticsearch_fieldnames';
 import { ProcessorEvent } from '../../../common/processor_event';
 import { rangeFilter } from '../../../common/utils/range_filter';
@@ -42,7 +43,9 @@ export async function getErrorRate({
   const filter = [
     { term: { [SERVICE_NAME]: serviceName } },
     { range: rangeFilter(start, end) },
-    { exists: { field: HTTP_RESPONSE_STATUS_CODE } },
+    {
+      terms: { [EVENT_OUTCOME]: [EventOutcome.failure, EventOutcome.success] },
+    },
     ...transactionNamefilter,
     ...transactionTypefilter,
     ...uiFiltersES,
@@ -60,7 +63,7 @@ export async function getErrorRate({
           date_histogram: getMetricsDateHistogramParams(start, end),
           aggs: {
             erroneous_transactions: {
-              filter: { range: { [HTTP_RESPONSE_STATUS_CODE]: { gte: 400 } } },
+              filter: { term: { [EVENT_OUTCOME]: EventOutcome.failure } },
             },
           },
         },