diff --git a/.apigentools-info b/.apigentools-info
index 3cd9653a1b8..8ddbd6e53bb 100644
--- a/.apigentools-info
+++ b/.apigentools-info
@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.5.1.dev2",
-            "regenerated": "2021-10-18 10:35:00.694439",
-            "spec_repo_commit": "303d2e3"
+            "regenerated": "2021-10-18 13:05:32.173095",
+            "spec_repo_commit": "3b56e2f"
         },
         "v2": {
             "apigentools_version": "1.5.1.dev2",
-            "regenerated": "2021-10-18 10:36:09.692595",
-            "spec_repo_commit": "303d2e3"
+            "regenerated": "2021-10-18 13:06:21.888029",
+            "spec_repo_commit": "3b56e2f"
         }
     }
 }
\ No newline at end of file
diff --git a/src/main/java/com/datadog/api/v1/client/model/Monitor.java b/src/main/java/com/datadog/api/v1/client/model/Monitor.java
index e8b5b3de8cd..c3a8c79972d 100644
--- a/src/main/java/com/datadog/api/v1/client/model/Monitor.java
+++ b/src/main/java/com/datadog/api/v1/client/model/Monitor.java
@@ -77,13 +77,13 @@ public class Monitor {
   private MonitorOverallStates overallState;
 
   public static final String JSON_PROPERTY_PRIORITY = "priority";
-  private Long priority;
+  private JsonNullable<Long> priority = JsonNullable.<Long>undefined();
 
   public static final String JSON_PROPERTY_QUERY = "query";
   private String query;
 
   public static final String JSON_PROPERTY_RESTRICTED_ROLES = "restricted_roles";
-  private List<String> restrictedRoles = null;
+  private JsonNullable<List<String>> restrictedRoles = JsonNullable.<List<String>>undefined();
 
   public static final String JSON_PROPERTY_STATE = "state";
   private MonitorState state;
@@ -301,7 +301,7 @@ public void setOverallState(MonitorOverallStates overallState) {
   }
 
   public Monitor priority(Long priority) {
-    this.priority = priority;
+    this.priority = JsonNullable.<Long>of(priority);
     return this;
   }
 
@@ -312,16 +312,26 @@ public Monitor priority(Long priority) {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Integer from 1 (high) to 5 (low) indicating alert severity.")
+  @JsonIgnore
+  public Long getPriority() {
+    return priority.orElse(null);
+  }
+
   @JsonProperty(JSON_PROPERTY_PRIORITY)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
-  public Long getPriority() {
+  public JsonNullable<Long> getPriority_JsonNullable() {
     return priority;
   }
 
-  public void setPriority(Long priority) {
+  @JsonProperty(JSON_PROPERTY_PRIORITY)
+  public void setPriority_JsonNullable(JsonNullable<Long> priority) {
     this.priority = priority;
   }
 
+  public void setPriority(Long priority) {
+    this.priority = JsonNullable.<Long>of(priority);
+  }
+
   public Monitor query(String query) {
     this.query = query;
     return this;
@@ -347,15 +357,19 @@ public void setQuery(String query) {
   }
 
   public Monitor restrictedRoles(List<String> restrictedRoles) {
-    this.restrictedRoles = restrictedRoles;
+    this.restrictedRoles = JsonNullable.<List<String>>of(restrictedRoles);
     return this;
   }
 
   public Monitor addRestrictedRolesItem(String restrictedRolesItem) {
-    if (this.restrictedRoles == null) {
-      this.restrictedRoles = new ArrayList<>();
+    if (this.restrictedRoles == null || !this.restrictedRoles.isPresent()) {
+      this.restrictedRoles = JsonNullable.<List<String>>of(new ArrayList<>());
+    }
+    try {
+      this.restrictedRoles.get().add(restrictedRolesItem);
+    } catch (java.util.NoSuchElementException e) {
+      // this can never happen, as we make sure above that the value is present
     }
-    this.restrictedRoles.add(restrictedRolesItem);
     return this;
   }
 
@@ -370,16 +384,26 @@ public Monitor addRestrictedRolesItem(String restrictedRolesItem) {
       value =
           "A list of role identifiers that can be pulled from the Roles API. Cannot be used with"
               + " `locked` option.")
+  @JsonIgnore
+  public List<String> getRestrictedRoles() {
+    return restrictedRoles.orElse(null);
+  }
+
   @JsonProperty(JSON_PROPERTY_RESTRICTED_ROLES)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
-  public List<String> getRestrictedRoles() {
+  public JsonNullable<List<String>> getRestrictedRoles_JsonNullable() {
     return restrictedRoles;
   }
 
-  public void setRestrictedRoles(List<String> restrictedRoles) {
+  @JsonProperty(JSON_PROPERTY_RESTRICTED_ROLES)
+  public void setRestrictedRoles_JsonNullable(JsonNullable<List<String>> restrictedRoles) {
     this.restrictedRoles = restrictedRoles;
   }
 
+  public void setRestrictedRoles(List<String> restrictedRoles) {
+    this.restrictedRoles = JsonNullable.<List<String>>of(restrictedRoles);
+  }
+
   public Monitor state(MonitorState state) {
     this.state = state;
     this.unparsed |= state.unparsed;
diff --git a/src/main/java/com/datadog/api/v1/openapi.yaml b/src/main/java/com/datadog/api/v1/openapi.yaml
index e2ee64c7988..b7865bcfcf4 100644
--- a/src/main/java/com/datadog/api/v1/openapi.yaml
+++ b/src/main/java/com/datadog/api/v1/openapi.yaml
@@ -17285,6 +17285,7 @@ components:
           format: int64
           maximum: 5
           minimum: 1
+          nullable: true
           type: integer
         query:
           description: The monitor query.
@@ -17296,6 +17297,7 @@ components:
           items:
             description: A role UUID.
             type: string
+          nullable: true
           type: array
         state:
           $ref: '#/components/schemas/MonitorState'