No cfnRole warned and unnecessary files was created after deploy

Serverless: Safeguards Processing...
Serverless: Safeguards Results:

   Summary --------------------------------------------------

   passed - no-unsafe-wildcard-iam-permissions
   passed - framework-version
   warned - require-cfn-role
   passed - allowed-runtimes
   passed - no-secret-env-vars
   passed - allowed-regions
   passed - allowed-stages

   Details --------------------------------------------------

   1) Warned - no cfnRole set
      details: http://slss.io/sg-require-cfn-role
      Require the cfnRole option,which specifies a particular role for CloudFormation to assume while deploying.

1. 我去过写详细信息的网站。 详细信息：http://slss.io/sg-require-cfn-role 无论如何，我不知道如何解决。
2. s_hello.py和s_hello2.py始终在部署后生成。 这是我的serverless.yaml文件

    service: myapp
    app: sample-app
    org: xxx
    provider:
      name: aws
      runtime: python3.7
    stage: dev
    region: us-east-1

    package:
        individually: true
    functions:
      hello:
        handler: src/handler/handler.hello
      hello2:
        handler: src/handler2/handler2.hello2

It's always happen although follow this site 。 我的Lambda函数将创建“ s_xxx.py（其中xxx是handler.py文件。