diff --git a/config/prometheus/additional_metrics.yml b/config/prometheus/additional_metrics.yml
index 13732384953..c994bad7865 100644
--- a/config/prometheus/additional_metrics.yml
+++ b/config/prometheus/additional_metrics.yml
@@ -29,14 +29,14 @@
       label: Pod average
       unit: ms
   - title: "HTTP Error Rate"
-    y_label: "HTTP 500 Errors / Sec"
+    y_label: "HTTP Errors"
     required_metrics:
       - nginx_upstream_responses_total
     weight: 1
     queries:
-    - query_range: 'sum(rate(nginx_upstream_responses_total{status_code="5xx", upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}[2m]))'
-      label: HTTP Errors
-      unit: "errors / sec"
+    - query_range: 'sum(rate(nginx_upstream_responses_total{status_code="5xx", upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}[2m])) / sum(rate(nginx_upstream_responses_total{upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}[2m])) * 100'
+      label: 5xx Errors
+      unit: "%"
 - group: Response metrics (HA Proxy)
   priority: 10
   metrics:
diff --git a/doc/user/project/integrations/prometheus_library/nginx_ingress.md b/doc/user/project/integrations/prometheus_library/nginx_ingress.md
index 590b1c4275a..a1db79538a4 100644
--- a/doc/user/project/integrations/prometheus_library/nginx_ingress.md
+++ b/doc/user/project/integrations/prometheus_library/nginx_ingress.md
@@ -14,7 +14,7 @@ GitLab has support for automatically detecting and monitoring the Kubernetes NGI
 | ---- | ----- |
 | Throughput (req/sec) | sum(rate(nginx_upstream_responses_total{upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}[2m])) by (status_code) |
 | Latency (ms) | avg(nginx_upstream_response_msecs_avg{upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}) |
-| HTTP Error Rate (HTTP Errors / sec) | sum(rate(nginx_upstream_responses_total{status_code="5xx", upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}[2m])) |
+| HTTP Error Rate (%) | sum(rate(nginx_upstream_responses_total{status_code="5xx", upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}[2m])) / sum(rate(nginx_upstream_responses_total{upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}[2m])) * 100 |
 
 ## Configuring NGINX ingress monitoring