Measurement

For our product to thrive, we must measure for success, as shown in the following examples:

• The number of new features released in a week is a good user-facing metric
• Requests that took over 200 ms to provide a response is an important metric for the engineers running your services
• Dollars spent on your site by customers is a crucial business dimension to review

In the previous chapter, we introduced rules that would trigger an event to enlarge our instance pool. Now, we will dig into the components of that method to better understand why this pattern is so important in the cloud.

Indicators

To demonstrate that we are accomplishing the right thing, we must identify signals that show what we are doing...