In a nutshell, Agile metrics are the standards that you set and use in order to measure the work of your team. They can also be referred to as Agile KPIs (key performance indicators). Agile metrics are not about measuring the amount of work or the actual tasks performed, but how much you were able to impact the end user.
Agile metrics and measurements can cover different aspects, such as productivity, quality, and team health. This means you might encounter terms such as Agile productivity metrics, Agile quality metrics, and Agile team metrics, among others.
Agile was originally used in software development teams so the metrics mostly corresponded to the specifics of their work.
Today, the framework is applied to many types of businesses. Thus, the Agile metrics can be diverse, matching the various workflows, yet following the same basic principles.
Agile project managers are typically responsible for establishing and tracking the metrics in conjunction with the project roadmap — which is agreed upon together with the team and relevant stakeholders.