What is a Timer Monitoring Metrics?

About

A Timer is a metrics type that sends two values:

• an integer: the count of events during the interval (to measure throughput)
• a duration: the interval duration (to measure latency ie Total time / count).

Example

Suppose:

• we configure publishing at 10-second intervals
• we saw 20 requests that each took 100ms.

Then for the first interval:

• count = 10 seconds * (20 requests / 10 seconds) = 20 requests
• total-time = 10 seconds * (20 * 100 ms / 10 seconds) = 2 seconds

Therefore:

• Rate: total-time/count = 10 requests / second

Type

Background Task

As a timer reports the total time, a timer may not send any record until the task is complete.

Interval

A timer may be calculated at intervals.

Library

Micrometer

Timer timer = Timer
  .builder("my.timer")
  .description("a description of what this timer does")
  .register(registry);

vertx.setPeriodic(1000, l -> {
  timer.record(() -> {
    // Running here some operation to monitor
  });
});