diff --git a/grafana-mixin/alerts/alerts.libsonnet b/grafana-mixin/alerts/alerts.libsonnet
index e38f2a4a72a..fbd957b4fb9 100644
--- a/grafana-mixin/alerts/alerts.libsonnet
+++ b/grafana-mixin/alerts/alerts.libsonnet
@@ -12,7 +12,7 @@
             alert: 'GrafanaRequestsFailing',
             expr: |||
               100 * namespace_job_handler_statuscode:grafana_http_request_duration_seconds_count:rate5m{handler!~"/api/datasources/proxy/:id.*|/api/ds/query|/api/tsdb/query", status_code=~"5.."}
-              / ignoring (status_code)
+              / ignoring (status_code) group_left
               sum without (status_code) (namespace_job_handler_statuscode:grafana_http_request_duration_seconds_count:rate5m{handler!~"/api/datasources/proxy/:id.*|/api/ds/query|/api/tsdb/query"})
               > %(grafanaRequestsFailingThresholdPercent)s
             ||| % $._config,