Regenerate client from commit 1bc9ac0 of spec repo

Author: ci.datadog-api-spec

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.4.1.dev11",
-            "regenerated": "2021-07-15 15:55:07.111886",
-            "spec_repo_commit": "18eae8f"
+            "regenerated": "2021-07-16 08:44:17.013238",
+            "spec_repo_commit": "1bc9ac0"
         },
         "v2": {
             "apigentools_version": "1.4.1.dev11",
-            "regenerated": "2021-07-15 15:55:43.649739",
-            "spec_repo_commit": "18eae8f"
+            "regenerated": "2021-07-16 08:45:02.228331",
+            "spec_repo_commit": "1bc9ac0"
         }
     }
 }

src/main/java/com/datadog/api/v1/openapi.yaml

@@ -17956,6 +17956,7 @@ components:
           The numeric value format should be a 32bit float gauge-type value.
           Current is defined as not more than 10 minutes in the future or more than 1 hour in the past.
         format: double
+        nullable: true
         type: number
       maxItems: 2
       minItems: 2