Until I used it on Play! scala application, I was a big fan of Newrelic for all performance indicators in production. However, I do not think that with Play! war. This will give you basic metrics with a free account. For most of my scala applications, I use newrelic annotations to collect metrics by a specific method that I want to track in detail - I saw that newrelic gives a lot of detailed results with Java than Scala, therefore, annotations.
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