title: Redirect traffic when Firebase Hosting is down
body: <p>I know by experience that with load balancers <strong>L7</strong> we can redirect traffic to others endpoints if applications become <em>unhealthy</em>.</p>
  <p>As Firebase Hosting is using <strong>CDN</strong> to deliver static content, is there a way to redirect traffic if this static content becomes unavailable?</p>
  <p>I thought of using <strong>DNS rules</strong> that uses redirect but I am concerned about the propagation time that may be too much. (and that could even take more time then Google resolving the incident)</p>
  <p>Is there a way to manage that with this service or should I switch to another kind of architecture?</p>