Regenerate client from commit 57fab8d of spec repo (#3417)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: api-clients-generation-pipeline[bot]

.generator/schemas/v2/openapi.yaml

@@ -137855,9 +137855,9 @@ paths:
   /api/v2/metrics/{metric_name}/volumes:
     get:
       description: |-
-        View hourly average metric volumes for the given metric name over the look back period.
-
-        Custom metrics generated in-app from other products will return `null` for ingested volumes.
+        View hourly average cardinality for the given metric name over the look back period.
+        For Metric Name Pricing customers, view total point volume for the given metric name
+        over the look back period.
       operationId: ListVolumesByMetricName
       parameters:
         - $ref: "#/components/parameters/MetricName"

lib/datadog_api_client/v2/api/metrics_api.rb

@@ -879,9 +879,9 @@ def list_volumes_by_metric_name(metric_name, opts = {})
 
     # List distinct metric volumes by metric name.
     #
-    # View hourly average metric volumes for the given metric name over the look back period.
-    #
-    # Custom metrics generated in-app from other products will return `null` for ingested volumes.
+    # View hourly average cardinality for the given metric name over the look back period.
+    # For Metric Name Pricing customers, view total point volume for the given metric name
+    # over the look back period.
     #
     # @param metric_name [String] The name of the metric.
     # @param opts [Hash] the optional parameters