Traditional monitoring tools
Traditional monitoring tools were designed for monolith systems, observing the health and behavior of a single application instance. They may be able to tell us a story about that single instance, but they know almost nothing about the distributed transaction that passed through it. These tools lack the context of the request.
Metrics
It goes like this: "Once upon a time…something bad happened. The end." How do you like this story? This is what the chart in Figure 1.5 tells us. It's not completely useless; we do see a spike and we could define an alert to fire when this happens. But can we explain or troubleshoot the problem?
Figure 1.5: A graph of two time series representing (hypothetically) the volume of traffic to ...
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