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Do you consider the performance impact when adding a new JavaScript file, an AJAX call or a new database query to your app? Neglectable you say? I disagree. Small changes can have a severe impact on performance and scalabilty. Many small changes will have an even bigger impact. If you are working on a delivery pipeline make sure to look into performance, scalability and architectural metrics such as # of Resources on your page, Size of Resources, Number of Requests hitting your web servers, database statements executed, log messages created. Monitoring these metrics allows you to add a new quality gate to your delivery pipeline and prevents major problems. In this talk you learn a handful of metrics to teach to your devs, test and ops folks. We learn why they are important by looking at specific examples that caused problems in real life apps and also how to monitor them.Read less