Package org.eclipse.microprofile.metrics.annotation

Annotation Type Gauge

  • @InterceptorBinding
@Retention(RUNTIME)
@Target({METHOD,ANNOTATION_TYPE})
public @interface Gauge
    An annotation for marking a method or field as a gauge. The metric will be registered in the application MetricRegistry.

    Given a method annotated with @Gauge like this: 

     
     @Gauge(name = "queueSize")
     public int getQueueSize() {
         return queue.size;
     }
    A gauge with the fully qualified class name + queueSize will be created which uses the annotated method's return value as its value. The annotated method/field must be of numeric type (extends Number).

    • Required Element Summary

      Required Elements 
      Modifier and Type Required Element Description
      String unit
      The unit of the gauge.

    • Optional Element Summary

      Optional Elements 
      Modifier and Type Optional Element Description
      boolean absolute
      Denotes whether to use the absolute name or use the default given name relative to the annotated class.
      String description
      The description of the gauge.
      String name
      The name of the gauge.
      String scope
      The scope that this gauge belongs to.
      String[] tags
      The tags of the gauge.

      • name

        String name
        The name of the gauge.
        Returns:
        The name of the gauge.
        Default:
        ""

      • tags

        String[] tags
        The tags of the gauge.
        Returns:
        The tags of the gauge. Each String tag must be in the form of 'key=value'. If the input is empty or does not contain a '=' sign, the entry is ignored.
        See Also:
        Metadata
        Default:
        {}

      • absolute

        boolean absolute
        Denotes whether to use the absolute name or use the default given name relative to the annotated class.
        Returns:
        If true, use the given name as an absolute name. If false (default), use the given name relative to the annotated class.
        Default:
        false

      • description

        String description
        The description of the gauge.
        Returns:
        The description of the gauge.
        See Also:
        Metadata
        Default:
        ""