Enhance D8

[leesjensen]

Students have trouble moving from the visualizingMetrics instruction and the K8 instruction to their implementation.

We need to demonstrate three things:

1. How to use middleware to capture general requests
2. How to capture the system metrics (cpu). This can be done in the metrics.js file by just either directly reporting the value or creating a sum of cpu over time.
3. How to capture application metrics such as the pizza purchases or factory latency. This needs some function that they can call that provides the values to metrics.js

We can enhance the visualizingmetrics instruction to show all three of these things and then simplify what is in k8 to only reference back to the previous instruction.

Simplify the track("endpoint") so that it is just a straight function.

Make builder in D8 suggestions just pseudo code.