Package org.apache.kafka.streams

Interface StreamsMetrics

public interface StreamsMetrics

The Kafka Streams metrics interface for adding metric sensors and collecting metric values.

Method Summary

Modifier and Type	Method	Description
Sensor	addLatencyRateTotalSensor(String scopeName, String entityName, String operationName, Sensor.RecordingLevel recordingLevel, String... tags)	Add a latency, rate and total sensor for a specific operation, which will include the following metrics: average latency max latency invocation rate (num.operations / seconds) total invocation count Whenever a user records this sensor via Sensor.record(double) etc, it will be counted as one invocation of the operation, and hence the rate / count metrics will be updated accordingly; and the recorded latency value will be used to update the average / max latency as well.
Sensor	addRateTotalSensor(String scopeName, String entityName, String operationName, Sensor.RecordingLevel recordingLevel, String... tags)	Add a rate and a total sensor for a specific operation, which will include the following metrics: invocation rate (num.operations / time unit) total invocation count Whenever a user records this sensor via Sensor.record(double) etc, it will be counted as one invocation of the operation, and hence the rate / count metrics will be updated accordingly.
Sensor	addSensor(String name, Sensor.RecordingLevel recordingLevel)	Generic method to create a sensor.
Sensor	addSensor(String name, Sensor.RecordingLevel recordingLevel, Sensor... parents)	Generic method to create a sensor with parent sensors.
Map<MetricName,? extends Metric>	metrics()	Get read-only handle on global metrics registry.
void	removeSensor(Sensor sensor)	Remove a sensor.

Method Details

metrics

Map<MetricName,? extends Metric> metrics()

Get read-only handle on global metrics registry.

Returns:

Map of all metrics.

addLatencyRateTotalSensor

Sensor addLatencyRateTotalSensor(String scopeName,
 String entityName,
 String operationName,
 Sensor.RecordingLevel recordingLevel,
 String... tags)

Add a latency, rate and total sensor for a specific operation, which will include the following metrics:

1. average latency
2. max latency
3. invocation rate (num.operations / seconds)
4. total invocation count

Whenever a user records this sensor via Sensor.record(double) etc, it will be counted as one invocation of the operation, and hence the rate / count metrics will be updated accordingly; and the recorded latency value will be used to update the average / max latency as well.

Note that you can add more metrics to this sensor after you created it, which can then be updated upon Sensor.record(double) calls.

The added sensor and its metrics can be removed with removeSensor().

Parameters:

scopeName - name of the scope, which will be used as part of the metric type, e.g.: "stream-[scope]-metrics".

entityName - name of the entity, which will be used as part of the metric tags, e.g.: "[scope]-id" = "[entity]".

operationName - name of the operation, which will be used as the name of the metric, e.g.: "[operation]-latency-avg".

recordingLevel - the recording level (e.g., INFO or DEBUG) for this sensor.

tags - additional tags of the sensor

Returns:

The added sensor.

See Also:

• addRateTotalSensor(String, String, String, Sensor.RecordingLevel, String...)
• removeSensor(Sensor)
• addSensor(String, Sensor.RecordingLevel, Sensor...)

addRateTotalSensor

Sensor addRateTotalSensor(String scopeName,
 String entityName,
 String operationName,
 Sensor.RecordingLevel recordingLevel,
 String... tags)

Add a rate and a total sensor for a specific operation, which will include the following metrics:

1. invocation rate (num.operations / time unit)
2. total invocation count

Whenever a user records this sensor via Sensor.record(double) etc, it will be counted as one invocation of the operation, and hence the rate / count metrics will be updated accordingly.

Note that you can add more metrics to this sensor after you created it, which can then be updated upon Sensor.record(double) calls.

The added sensor and its metrics can be removed with removeSensor().

Parameters:

scopeName - name of the scope, which will be used as part of the metrics type, e.g.: "stream-[scope]-metrics".

entityName - name of the entity, which will be used as part of the metric tags, e.g.: "[scope]-id" = "[entity]".

operationName - name of the operation, which will be used as the name of the metric, e.g.: "[operation]-total".

recordingLevel - the recording level (e.g., INFO or DEBUG) for this sensor.

tags - additional tags of the sensor

Returns:

The added sensor.

See Also:

• addLatencyRateTotalSensor(String, String, String, Sensor.RecordingLevel, String...)
• removeSensor(Sensor)
• addSensor(String, Sensor.RecordingLevel, Sensor...)

addSensor

Sensor addSensor(String name,
 Sensor.RecordingLevel recordingLevel)

Generic method to create a sensor. Note that for most cases it is advisable to use addRateTotalSensor() or addLatencyRateTotalSensor() to ensure metric name well-formedness and conformity with the rest of the Kafka Streams code base. However, if the above two methods are not sufficient, this method can also be used.

Parameters:

name - name of the sensor.

recordingLevel - the recording level (e.g., INFO or DEBUG) for this sensor

Returns:

The added sensor.

See Also:

• addRateTotalSensor(String, String, String, Sensor.RecordingLevel, String...)
• addLatencyRateTotalSensor(String, String, String, Sensor.RecordingLevel, String...)
• removeSensor(Sensor)

addSensor

Sensor addSensor(String name,
 Sensor.RecordingLevel recordingLevel,
 Sensor... parents)

Generic method to create a sensor with parent sensors. Note that for most cases it is advisable to use addRateTotalSensor() or addLatencyRateTotalSensor() to ensure metric name well-formedness and conformity with the rest of the Kafka Streams code base. However, if the above two methods are not sufficient, this method can also be used.

Parameters:

name - name of the sensor

recordingLevel - the recording level (e.g., INFO or DEBUG) for this sensor

Returns:

The added sensor.

See Also:

• addRateTotalSensor(String, String, String, Sensor.RecordingLevel, String...)
• addLatencyRateTotalSensor(String, String, String, Sensor.RecordingLevel, String...)
• removeSensor(Sensor)

removeSensor

void removeSensor(Sensor sensor)

Remove a sensor.

Parameters:

sensor - sensor to be removed