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MetricRegistry is a class responsible for metrics registering, there is a metrics container in it. It provides register method for each type of measurable metric, registering metrics will put metrics to the metrics container.

public class MetricRegistry {

	/** Map of gauge metrics. */
    private final Map<String, Gauge<?>> gauges = new HashMap<>();

    /** Map of counter metrics. */
    private final Map<String, Counter> counters = new HashMap<>();

	/** Register gauge metric. */
 	public void gauge(String name, Gauge gauge) {}

	/** Register counter metric. */
	public void counter(String name, Counter counter) {}
}

MetricsReporter

MetricsReporter  is used to report metrics to external backend, Paimon will implement an out of box reporter as JMX `MetricsReporter`.

public interface MetricsReporter {
	/** Configure reporter after instantiating it.*/
     void open();

    /** Closes this reporter. */
    void close();

	/** Report the current measurements. This method is called periodically by the Metrics. */
	void report();
}

CommitMetrics / ScanMetrics / CompactionMetrics

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