A measurement is a single event that contains, at a minimum, the duration and the success or failure of the event.

Measurements include your app's critical workflows, core web vitals, long-running tasks, rendering time, or any other event that is important to the performance of your application.

The exact answer is determined by:

• The number of measurements instrumented in the application code.
• The number of real users of your app that will complete (success or failure) a measurement.

In general, we recommend instrumenting the critical paths of your application and establishing objectives that are both aspirational as well as your current benchmark targets.

An objective is a specific and measurable goal that represents the desired performance or reliability of your web application.

Objectives targets are defined using a threshold: either a lower-boundary (less-than-or-equal-to) or a bounded threshold.

Indicators are the performance and reliability metrics of your web application. Indicators allow you to filter and segment the measurements in your application.

Notifications are sent in real-time as soon as the objective threshold is breached. Notifications are sent via a webhook. The time it takes to receive the notification is dependent on the webhook's response time.

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