In the previous chapter, we explored methods of deploying our code.

Now that the code has been safely deployed to your servers with the deployment solution of your choice, you need to watch over it to make sure it's running properly. You can spend a lot of time preparing for the many modes of failure that you may envision during development. In the end, your software will probably break for other reasons altogether than those you prepared for. If your system breaks, it can be very expensive for your organization, either in lost revenue or in terms of lost credibility, which, in the end, might amount to the same thing. You need to know as quickly as possible what has gone wrong in order to deal with the situation.

Given the potential negative impact of service downtime, there are many alternative solutions that approach the problem domain of watching over your deployed code from different angles and viewpoints.

In this chapter, we will have a look at several of...