What is an APM Service?
Briefly

Application performance monitoring (APM) services are tools that can help you understand how well or poorly your app is performing for your customers, your end users.APM services or products are typically provided by third parties and help you track key information about your application, such as latency, but they also help you understand trends over time and allow your business to achieve specific SLAs (service level agreements) or SLOs (service level objectives).
Read at New Relic
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