| Interface | Description | 
|---|---|
| Metric | Handler for manipulating one user-defined metric. | 
| Class | Description | 
|---|---|
| JobMetrics | An immutable collection of job-specific metrics, pairs of metric names
 and sets of associated  Measurements. | 
| Measurement | Immutable data class containing information about one metric measurement,
 consisting of:
 
 metric value
 metric timestamp, generated when the metric was gathered
 metric descriptor (set of tag name-value pairs) 
  | 
| MeasurementPredicates | Static utility class for creating various  Measurementfiltering
 predicates. | 
| MetricNames | Each metric provided by Jet has a specific name which conceptually
 identifies what it's being used to measure. | 
| Metrics | Utility class for obtaining handlers to user-defined metrics. | 
| MetricsDataSerializerHook | A Java Service Provider hook for Hazelcast's Identified Data Serializable
 mechanism. | 
| MetricTags | Metric descriptors are formed from a comma separated list of  tag_name=tag_valuepairs. | 
| Enum | Description | 
|---|---|
| Unit | Measurement unit of user-defined metrics (see  Metric). | 
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