title: CloudFormation alarm for multiple Lambdas
body: <p>I have an app with a bunch of Lambdas. Instead of adding one CloudWatch alarm for each is there a way to combine all of them into one alarm that goes off if any of the Lambdas error out?</p>
  <p>So far I tried:</p>
  <ul>
  <li>Adding each function as a dimension (CloudFormation complains about duplicate FunctionNames)</li>
  <li>Adding each function as a dimension with a different key than FunctionName, CloudFormation doesn't complain, but it doesn't really work either.</li>
  </ul>