diff --git a/apmpackage/apm/changelog.yml b/apmpackage/apm/changelog.yml
index 0d97df51bd9..e3cb5b99b24 100644
--- a/apmpackage/apm/changelog.yml
+++ b/apmpackage/apm/changelog.yml
@@ -3,7 +3,7 @@
     - description: Enable synthetic source for metrics data streams
       type: enhancement
       link: https://github.com/elastic/apm-server/pull/9756
-    - description: Change transaction.success_count type to aggregate_metric_double
+    - description: Remove `transaction.failure_count` and change `transaction.success_count` type to aggregate_metric_double
       type: enhancement
       link: https://github.com/elastic/apm-server/pull/9791
 - version: "8.6.0"
diff --git a/apmpackage/apm/data_stream/internal_metrics/fields/fields.yml b/apmpackage/apm/data_stream/internal_metrics/fields/fields.yml
index 535bf9d029c..09ae3d7ec84 100644
--- a/apmpackage/apm/data_stream/internal_metrics/fields/fields.yml
+++ b/apmpackage/apm/data_stream/internal_metrics/fields/fields.yml
@@ -126,9 +126,6 @@
   type: keyword
   description: |
     Keyword of specific relevance in the service's domain (eg: 'db.postgresql.query', 'template.erb', 'cache', etc).
-- name: transaction.failure_count
-  type: long
-  description: "Count of transactions with 'event.outcome: failure'"
 - name: transaction.duration.histogram
   type: histogram
   description: |
diff --git a/changelogs/head.asciidoc b/changelogs/head.asciidoc
index 0e0cebada30..c709de97d65 100644
--- a/changelogs/head.asciidoc
+++ b/changelogs/head.asciidoc
@@ -10,7 +10,7 @@ https://github.com/elastic/apm-server/compare/8.5\...main[View commits]
 - `context.http.response.*_size` fields now enforce integer values {pull}9429[9429]
 - `observer.id` and `observer.ephemeral_id` are no longer added to APM documents {pull}9412[9412]
 - `timeseries.instance` has been removed from transaction metrics docs; it was never used {pull}9565[9565]
-- `transaction.success_count` type has changed to `aggregated_metric_double` {pull}9791[9791]
+- `transaction.failure_count` has been removed. `transaction.success_count` type has changed to `aggregated_metric_double` {pull}9791[9791]
 
 [float]
 ==== Deprecations
diff --git a/internal/model/transaction.go b/internal/model/transaction.go
index 88885aa8138..c112b834de8 100644
--- a/internal/model/transaction.go
+++ b/internal/model/transaction.go
@@ -60,15 +60,6 @@ type Transaction struct {
 	// is subject to removal.
 	DurationSummary SummaryMetric
 
-	// FailureCount holds an aggregated count of transactions with the
-	// outcome "failure". If FailureCount is zero, it will be omitted from
-	// the output event.
-	//
-	// NOTE(axw) this is used only for service metrics, which are in technical
-	// preview. Do not use this field without discussion, as the field mapping
-	// is subject to removal.
-	FailureCount int
-
 	// SuccessCount holds an aggregated count of transactions with different
 	// outcomes. A "failure" adds to the Count. A "success" adds to both the
 	// Count and the Sum. An "unknown" has no effect. If Count is zero, it
@@ -109,9 +100,6 @@ func (e *Transaction) fields() mapstr.M {
 	if e.DurationSummary.Count != 0 {
 		transaction.maybeSetMapStr("duration.summary", e.DurationSummary.fields())
 	}
-	if e.FailureCount != 0 {
-		transaction.set("failure_count", e.FailureCount)
-	}
 	if e.SuccessCount.Count != 0 {
 		transaction.maybeSetMapStr("success_count", e.SuccessCount.fields())
 	}
diff --git a/x-pack/apm-server/aggregation/servicemetrics/aggregator.go b/x-pack/apm-server/aggregation/servicemetrics/aggregator.go
index a5a56d69ce9..ea31363e748 100644
--- a/x-pack/apm-server/aggregation/servicemetrics/aggregator.go
+++ b/x-pack/apm-server/aggregation/servicemetrics/aggregator.go
@@ -372,8 +372,7 @@ func makeMetricset(key aggregationKey, metrics serviceMetrics) model.APMEvent {
 			Name:     metricsetName,
 		},
 		Transaction: &model.Transaction{
-			Type:         key.transactionType,
-			FailureCount: int(math.Round(metrics.failureCount)),
+			Type: key.transactionType,
 			SuccessCount: model.SummaryMetric{
 				Count: int64(math.Round(metrics.successCount + metrics.failureCount)),
 				Sum:   metrics.successCount,
diff --git a/x-pack/apm-server/aggregation/servicemetrics/aggregator_test.go b/x-pack/apm-server/aggregation/servicemetrics/aggregator_test.go
index f31dec18d0c..16135e7056c 100644
--- a/x-pack/apm-server/aggregation/servicemetrics/aggregator_test.go
+++ b/x-pack/apm-server/aggregation/servicemetrics/aggregator_test.go
@@ -124,7 +124,6 @@ func TestAggregatorRun(t *testing.T) {
 				Count: 5,
 				Sum:   2,
 			},
-			FailureCount: 3,
 		},
 	}, {
 		Processor: model.MetricsetProcessor,