diff --git a/charts/generic-service/README.md b/charts/generic-service/README.md
index def47a2..c5bb2e0 100644
--- a/charts/generic-service/README.md
+++ b/charts/generic-service/README.md
@@ -157,6 +157,7 @@ app:
 | `alerting.http.referenceInterval`               | `1w`                        | The time interval to compare with the sample interval to detect changes                                  |
 | `alerting.http.maxSlowdown`                     | `2.5`                       | The maximum HTTP response slowdown in the sample interval compared to the reference interval             |
 | `alerting.http.max4xxRatio`                     | `2.5`                       | The maximum HTTP 4xx ratio increase in the sample interval compared to the reference interval            |
+| `alerting.http.maxClientCancellationRatio`      | `2.5`                       | The maximum client cancellation ratio increase in the sample interval compared to the reference interval |
 | `alerting.http.max5xxCount`                     | `0`                         | The maximum number of HTTP 5xx responses (except 504) in the sample interval                             |
 | `alerting.http.maxTimeoutCount`                 | `0`                         | The maximum number of HTTP gateway timeout responses (504) in the sample interval                        |
 | `alerting.grpc.requestsMetric`                  | `grpc_server_handled_total` | The name of the Prometheus metric counting gRPC requests                                                 |
diff --git a/charts/generic-service/templates/alerts.yaml b/charts/generic-service/templates/alerts.yaml
index e694bca..72b24d7 100644
--- a/charts/generic-service/templates/alerts.yaml
+++ b/charts/generic-service/templates/alerts.yaml
@@ -165,15 +165,20 @@ spec:
             topic: ingress
           annotations: {{- include "generic-service.alert-annotations" . | nindent 12 }} HTTP responses slower than usual
             description: '{{ include "generic-service.fullname" . }} HTTP responses are {{"{{ $value }}"}}x slower in the last {{ .Values.alerting.http.sampleInterval }} than in the last {{ .Values.alerting.http.referenceInterval }}.'
-
         - alert: Http4xx
           expr: |
-            (sum(rate({{ include "generic-service.request-code-count-metric" . }}"4.."}[{{ .Values.alerting.http.sampleInterval }}])) / sum(rate({{ include "generic-service.request-count-metric" . }}[{{ .Values.alerting.http.sampleInterval }}]))) /
-            (sum(rate({{ include "generic-service.request-code-count-metric" . }}"4.."}[{{ .Values.alerting.http.referenceInterval }}])) / sum(rate({{ include "generic-service.request-count-metric" . }}[{{ .Values.alerting.http.referenceInterval }}])))
-            > {{ .Values.alerting.http.max4xxRatio }}
+            (sum(rate({{ include "generic-service.request-code-count-metric" . }}"4.."}[{{ .Values.alerting.http.sampleInterval }}])) - sum(rate({{ include "generic-service.request-code-count-metric" . }}"499"[{{ .Values.alerting.http.sampleInterval }}]))) / 
+            (sum(rate({{ include "generic-service.request-code-count-metric" . }}"4.."}[{{ .Values.alerting.http.referenceInterval }}])) - sum(rate({{ include "generic-service.request-code-count-metric" . }}"499"[{{ .Values.alerting.http.referenceInterval }}])))) > {{ .Values.alerting.http.max4xxRatio }}
           labels: {{- include "generic-service.alert-labels" . | nindent 12 }} warning
           annotations: {{- include "generic-service.alert-annotations" . | nindent 12 }} higher HTTP 4xx rate
             description: '{{ include "generic-service.fullname" . }} gave {{"{{ $value }}"}}x more HTTP 4xx responses per request in the last {{ .Values.alerting.http.sampleInterval }} than in the last {{ .Values.alerting.http.referenceInterval }}.'
+        - alert: HttpClientCancelled
+          expr: |
+            (sum(rate({{ include "generic-service.request-code-count-metric" . }}"499"[{{ .Values.alerting.http.sampleInterval }}]))) / 
+            (sum(rate({{ include "generic-service.request-code-count-metric" . }}"499"[{{ .Values.alerting.http.referenceInterval }}])))) > {{ .Values.alerting.http.maxClientCancellationRatio }}
+          labels: {{- include "generic-service.alert-labels" . | nindent 12 }} warning
+          annotations: {{- include "generic-service.alert-annotations" . | nindent 12 }} higher HTTP client cancellation rate
+            description: '{{ include "generic-service.fullname" . }} gave a {{"{{ $value }}"}}x higher percentage of HTTP request cancelled by the client in the last {{ .Values.alerting.http.sampleInterval }} than in the last {{ .Values.alerting.http.referenceInterval }}.'
         {{- end }}
 
         - alert: Http5xx
diff --git a/charts/generic-service/values.schema.json b/charts/generic-service/values.schema.json
index f10b3ad..27390bb 100644
--- a/charts/generic-service/values.schema.json
+++ b/charts/generic-service/values.schema.json
@@ -886,6 +886,11 @@
               "default": 2.5,
               "description": "The maximum HTTP 4xx ratio increase in the sample interval compared to the reference interval"
             },
+            "maxClientCancellationRatio": {
+              "type": "number",
+              "default": 2.5,
+              "description": "The maximum client cancellation ratio increase in the sample interval compared to the reference interval"
+            },
             "max5xxCount": {
               "type": "number",
               "default": 0,
diff --git a/charts/generic-service/values.yaml b/charts/generic-service/values.yaml
index 3d52b02..3c2b733 100644
--- a/charts/generic-service/values.yaml
+++ b/charts/generic-service/values.yaml
@@ -172,6 +172,7 @@ alerting:
     referenceInterval: 1w
     maxSlowdown: 2.5
     max4xxRatio: 2.5
+    maxClientCancellationRatio: 2.5
     max5xxCount: 0
     maxTimeoutCount: 0
   grpc: