Update metric name to match latest vLLM changes

Author: sd109

chart/templates/api/config-map-grafana-dashboard.yml

@@ -118,7 +118,7 @@ data:
                 "uid": "prometheus"
               },
               "editorMode": "code",
-              "expr": "sum by (container, namespace, method, path) (rate(requests_total_counter[1m]))",
+              "expr": "sum by (container, namespace, method, path) (rate(vllm:request_success_total[1m]))",
               "instant": false,
               "legendFormat": "__auto",
               "range": true,
@@ -726,4 +726,4 @@ data:
       "version": 1,
       "weekStart": ""
     }
-{{- end -}}
+{{- end -}}