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jersey-all is a rebundled verison of Jersey as one OSGi bundle.
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package org.glassfish.jersey.server.monitoring;

import java.util.Map;

/**
 * Monitoring statistics of responses produced by application.
 * 
 * Statistics retrieved from Jersey runtime might be mutable and thanks to it might provide inconsistent data
 * as not all statistics are updated in the same time. To retrieve the immutable and consistent
 * statistics data the method {@link #snapshot()} should be used.
 * 
 *
 * @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
 * @see MonitoringStatistics See monitoring statistics for general details about statistics.
 */
public interface ResponseStatistics {

    /**
     * Returns the response code of a last response written by the application.
     *
     * @return Last response status code.
     */
    public Integer getLastResponseCode();

    /**
     * Returns statistics of response codes produces by the application. Keys of a returned
     * map are response status codes and values is the the count of responses with these
     * status count. Values are measured since start of the application.
     *
     * @return Map with status codes keys and count as values.
     */
    public Map getResponseCodes();


    /**
     * Get the immutable and consistent snapshot of the monitoring statistics. Working with snapshots might
     * have negative performance impact as snapshot must be created but ensures consistency of data over time.
     * However, the usage of snapshot is encouraged to avoid working with inconsistent data. Not all statistics
     * must be updated in the same time on mutable version of statistics.
     *
     * @return Snapshot of response statistics.
     */
    public ResponseStatistics snapshot();
}