AIP-133/AIP-155: request_id not allowed to be required

[loeffel-io]

Environment details

• OS: macOS 26.3.1 25D2128
• Language runtime version: bzlmod @protobuf 31.1
• Package version: 2.0.0 (but i think should still exists in 2.3.1, untested)

Steps to reproduce

  // A unique identifier for this request
  string request_id = 3 [
    (google.api.field_behavior) = REQUIRED, <------
    (google.api.field_info).format = UUID4
  ];

Hey @noahdietz and @quirogas,

AIP-155 says Request IDs should be optional.
core::0133::request-required-fields disallow to set request_id to REQUIRED.

Is this the expected behavior?

Thanks 🫶

[loeffel-io]

required to make the linter happy

  // (-- api-linter: core::0133::method-signature=disabled
  //     aip.dev/not-precedent: https://github.com/googleapis/api-linter/issues/1618 --)
  rpc CreateUserBillingAccount(CreateUserBillingAccountRequest) returns (UserBillingAccount) {
    option (google.api.http) = {
      post: "/v1/{parent=projects/*/users/*}/billingAccounts"
      body: "user_billing_account"
    };
    option (google.api.method_signature) = "parent,user_billing_account,request_id";
  }

// Represents the create user billing account request
//
// (-- api-linter: core::0133::request-required-fields=disabled
//     aip.dev/not-precedent: https://github.com/googleapis/api-linter/issues/1618 --)
message CreateUserBillingAccountRequest {
  // The parent resource where this user billing account will be created.
  // Format: projects/{project}/users/{user}
  string parent = 1 [
    (google.api.resource_reference) = {child_type: "billing.mindful.com/UserBillingAccount"},
    (google.api.field_behavior) = REQUIRED,
    (buf.validate.field).string = {pattern: "^projects\\/[a-z]([a-z0-9-]{0,61}[a-z0-9])?\\/users\\/[a-zA-Z0-9-]{1,128}$"}
  ];
  // The user billing account to create
  UserBillingAccount user_billing_account = 2 [
    (google.api.field_behavior) = REQUIRED,
    (buf.validate.field).required = true
  ];
  // A unique identifier for this request
  string request_id = 3 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.field_info).format = UUID4
  ];
}