code: func (*ssmClientCreator) NewSSMClient(region string,
  	creds credentials.IAMRoleCredentials) ssmclient.SSMClient {
  	cfg := aws.NewConfig().
  		WithHTTPClient(httpclient.New(roundtripTimeout, false)).
  		WithRegion(region).
  		WithCredentials(
  			awscreds.NewStaticCredentials(creds.AccessKeyID, creds.SecretAccessKey,
  				creds.SessionToken))
  	sess := session.Must(session.NewSession(cfg))
  	return ssm.New(sess)
  }
docs: //SSM Client will automatically retry 3 times when has throttling error