What is APM?
Briefly

What can you monitor with an application performance monitoring solution?A software application often has many different services and layers to monitor, and APM can be used to monitor each of those layers.For example, an APM solution can be used to collect current and historical information about the following layers:


     
Infrastructure including memory usage, CPU utilization, and application availability
     
Application backend such as database query performance and error analysis
     
Application frontend including web browser rendering, user experience monitoring, and performance metrics


APM isn't limited to monitoring websites.
Read at New Relic
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