Fix issue where qpsPanel shows an empty series name for gRPC requests with an underscore in their status code (#1519)

Author: charleskorn

grafana-builder/grafana.libsonnet

@@ -485,7 +485,7 @@ local utils = import 'mixin-utils/utils.libsonnet';
             sum by (status) (
               label_replace(label_replace(rate(%s[$__rate_interval]),
               "status", "${1}xx", "%s", "([0-9]).."),
-              "status", "${1}", "%s", "([a-zA-Z]+)"))
+              "status", "${1}", "%s", "([a-zA-Z_]+)"))
           ||| % [selector, statusLabelName, statusLabelName],
         format: 'time_series',
         legendFormat: '{{status}}',
@@ -503,7 +503,7 @@ local utils = import 'mixin-utils/utils.libsonnet';
           sum by (status) (
             label_replace(label_replace(%(metricQuery)s,
             "status", "${1}xx", "%(label)s", "([0-9]).."),
-            "status", "${1}", "%(label)s", "([a-zA-Z]+)"))
+            "status", "${1}", "%(label)s", "([a-zA-Z_]+)"))
         |||,
       native: template % { metricQuery: nativeClassicQuery.native, label: statusLabelName },
       classic: template % { metricQuery: nativeClassicQuery.classic, label: statusLabelName },