Summary

We've covered much ground in this chapter about the metrics signal. We started by familiarizing ourselves with the different components and terminology of the metrics pipeline and how to configure them. We then looked at all the ins and outs of the individual instruments available to record measurements and used each one to record sample metrics.

Using views, we learned to aggregate, filter, and customize the metric streams being emitted by our application to fit our specific needs. This will be handy when we start leveraging instrumentation libraries. Finally, we returned to the grocery store to get hands-on experience with instrumenting an existing application and collecting real-world metrics.

Metrics is a deep topic that goes well beyond what has been covered in this chapter, but hopefully, what you've learned thus far is enough to start considering how OpenTelemetry can be used in your code. The next chapter will look at the third and final signal we will...