Assertions for Metrics / Performance

We have a more detailed guide on working with the HTTP response, but wanted to provide specifics on creating assertions against performance metrics. Here is an example using the CODE VIEW of the code. Please note that overall refers to fetch and latency combined.
<assert-less expression="payload_response.metrics.latency" value="200" type="integer"/>

<assert-less expression="payload_response.metrics.fetch" value="350" type="integer"/>

<assert-less expression="payload_response.metrics.overall" value="450" type="integer"/>