Adjust Prometheus Stats dashboard

"handler" label value was changed in Prometheus 2.12.0, now it
contains "/api/v1/" prefix.

Change-Id: I17481d4e2689269121f3b8b2b732ca56697d91bb
Related-PROD: PROD-32407
(cherry picked from commit fabf29c04ff58860f0ef20bb82046341fd6a663a)
diff --git a/prometheus/files/grafana_dashboards/server/2.0/prometheus_stats_prometheus.json b/prometheus/files/grafana_dashboards/server/2.0/prometheus_stats_prometheus.json
index 9ccb8ac..81c2297 100644
--- a/prometheus/files/grafana_dashboards/server/2.0/prometheus_stats_prometheus.json
+++ b/prometheus/files/grafana_dashboards/server/2.0/prometheus_stats_prometheus.json
@@ -651,7 +651,7 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "rate(prometheus_http_request_duration_seconds_count{handler=~\"/(query|query_range)\",instance=~\"$instance:[1-9][0-9]*\"}[$rate_interval])",
+          "expr": "rate(prometheus_http_request_duration_seconds_count{handler=~\".*/(query|query_range)\",instance=~\"$instance:[1-9][0-9]*\"}[$rate_interval])",
           "format": "time_series",
           "hide": false,
           "intervalFactor": 2,