Creating an alert of an elevated error rate in our application

As a reminder, our helloworld application has a very simple design:

All user traffic is going through an ELB instance. Since we use the HTTP to communicate, we can easily identify when something unexpected is happening.

If you take a closer look at the monitoring tab of one of your load balancer instances (, you will see some of the top-level metrics you should care about:

While each application has its own behavior, an increase in latency or HTTP 5XXs is ...

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