Writing custom health indicators
Knowing the state of the application that is running in the production, especially in a large-scale distributed system, is just as—if not more—important than having things such as automated testing and deployment. In today's fast paced IT world, we can't really afford much downtime, so we need to have the information about the health of the application at our fingertips, ready to go at a minute's notice. If the all-so-important database connections go down, we want to see it right away and be able to quickly remedy the situation; the customers are not going to be waiting around for long before they go to another site.
We will resume working on our BookPub application in the state as we left it in the previous chapter. ...
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