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Release Notes

v4.0.0: Dec 24 2017

  • Compiled and targeted JDK8
  • Support for running under JDK9 #1236
  • Move JMX reporting to the metrics-jmx module
  • Add Bill of Materials for Metrics #1239 #1239
  • Used Java 8 Time API for data formatting
  • Removed unnecessary reflection hacks for HealthCheckRegistry
  • Removed internal LongAdder
  • Removed internal ThreadLocalRandom
  • Optimized generating random numbers
  • Timer.Context now implements AutoCloseable
  • Upgrade Jetty integration to Jetty 9.4
  • Support tracking Jersey filters in Jersey resources #1118
  • Add ResponseMetered annotation for Jersey resources #1186
  • Add a method for timing non-throwing functions. #1224
  • Unnecessary clear operation for ChunkedAssociativeArray #1211
  • Add some common metric filters #1210
  • Add possibility to subclass Timer.Context #1226

v3.2.6: Dec 24 2017

  • Jetty9: unhandled response should be counted as 404 and not 200 #1232
  • Prevent NaN values when calculating mean #1230
  • Avoid NaN values in WeightedSnapshot #1233

v3.2.5: Sep 15 2017

  • [InstrumentedScheduledExecutorService] Fix the scheduledFixedDelay to call the correct method #1192

v3.2.4: Aug 24 2017

  • Fix GraphiteReporter rate reporting #1167
  • Remove non Jdk6 compatible letter from date pattern #1163
  • Fix uncaught CancellationException when stopping reporter #1170

v3.2.3: Jun 28 2017

  • Improve ScheduledReporter convertDurations precision #1115
  • Suppress all kinds of Throwables raised by report() #1128
  • ExponentiallyDecayingReservoir was giving incorrect values in the snapshot if the inactive period was too long #1135
  • Ability to get default metrics registry without an exception #1140
  • Ability to get default health check registry without an exception #1152
  • SlidingTimeWindowArrayReservoir as a fast alternative of SlidingTimeWindowReservoir #1139
  • Avoid a NPE in toString of HealthCheck.Result #1141

v3.1.5: Jun 2 2017

  • More robust lookup of ThreadLocal and LongAdder on JDK6 (e.g. WebLogic) #1136

v3.2.2: Mar 20 2017

  • Fix creating a uniform snapshot from a collection #1111
  • Register metrics defined at Resource level #1105

v3.2.1: Mar 10 2017

  • Support for shutting down the health check registry. #1084
  • Added support for the default shared health check registry name #1095 #1095
  • SharedMetricRegistries are now thread-safe. #1094
  • The size of the snapshot of a histogram is reported via JMX. #1102
  • Don’t ignore the counter attribute for reporters. #1090
  • Added support for disabling attributes in ConsoleReporter. #1092
  • Rollbacked GraphiteSanitize to replacing whitespaces. #1099

v3.1.4: Mar 10 2017

  • Fix accidentally broken Graphite UDP reporter #1100

v3.2.0: Feb 24 2017

  • GraphiteReporter opens a new TCP connection when sending metrics instead of maintaining a persisted connection. #1047
  • GraphiteReporter retries DNS lookups in case of a lookup failure. #1064
  • ScheduledReporter suppresses all kind of exceptions raised by the report method. #1049
  • JDK’s ThreadLocalRandom is now used by default. #1052
  • JDK’s LongAdder is now used by default. #1055
  • Fixed a race condition bug in ExponentiallyDecayingReservoir. #1033
  • Fixed a long overflow bug in SlidingTimeWindowReservoir. #1063
  • AdminServlet supports CPU profiling. #927
  • GraphiteReporter sanitizes metrics. #938
  • Support for publishing BigInteger and BigDecimal metrics in GraphiteReporter. #933
  • Support for publishing boolean metrics in GraphiteReporter. #905
  • Added support for overriding the format of floating numbers in GraphiteReporter. #1073
  • Added support for disabling reporting of metric attributes. #1048
  • Reporters are more user friendly for managed environments like GAE or JEE. #1018
  • Support for setting a custom initial delay for reporters. #999
  • Support for custom details in a result of a health check. #663
  • Added a listener for health checks. #1068
  • Support for asynchronous health checks #1077
  • Health checks are reported as unhealthy on exceptions. #783
  • Allow setting a custom prefix for Jetty’s InstrumentedQueuedThreadPool. #947
  • Allow setting custom prefix for Jetty’s QueuedThreadPool. #908
  • Added support for Jetty 9.3 and higher. #1038
  • Fixed instrumentation of Jetty9 async servlets. #1074
  • Added support for JCache/JSR 107 metrics. #1010
  • Added thread-safe getters for metrics with custom instantiations. #1023
  • Added an overload of Timer#time that takes a Runnable. #989
  • Support extracting the request URI from wrapped requests in HttpClientMetricNameStrategies. #947
  • Support for the log4j2 xml-based config. #900
  • Internal Striped64 doesn’t depend on sun.misc.Unsafe anymore. #966
  • Optimized creation of UniformSnapshot. #970
  • Added a memory pool gauge to the JVM memory usage metrics. #786
  • Added support for async servlets for metric-servlet. #796
  • Opt-in default shared metric registry. #801
  • Added support for patterns in MBean object names #809
  • Allow a pluggable strategy for the name of the CSV files for CsvReporter. #882
  • Upgraded to slf4j 1.22
  • Upgraded to Jackson 2.6.6
  • Upgraded to amqp-client 3.6.6
  • Upgraded to httpclient 4.5.2
  • Upgraded to log4j2 2.3
  • Upgraded to logback 1.1.10

v3.1.3: Feb 24 2017

  • GraphiteReporter opens a new TCP connection when sending metrics instead of maintaining a persisted connection. #1036
  • GraphiteReporter retries DNS lookups in case of a lookup failure. #1064
  • ScheduledReporter suppresses all kind of exceptions raised by the report method. #1040
  • JDK’s ThreadLocalRandom is now used by default. #1052
  • JDK’s LongAdder is now used by default. #1055
  • Fixed a race condition bug in ExponentiallyDecayingReservoir. #1046
  • Fixed a long overflow bug in SlidingTimeWindowReservoir. #1072

v3.1.0: Sen 10 2014!topic/metrics-user/zwzHnMBcAX4

  • Upgrade to Jetty 9.1 (metrics-jetty9, Jetty 9.0 module renamed to metrics-jetty9-legacy)
  • Add log4j2 support (metrics-log4j2)
  • Upgrade to Jersey2 (metrics-jersey2)
  • Add httpasyncclient support (metrics-httpasyncclient)
  • Changed maven groupId to io.dropwizard.metrics
  • Enable Java8 builds on Travis, fix javadocs and disable some doclinting
  • Fixing some compilation warnings about missing generics and varargs invocation
  • Instrumentation for java.util.concurrent classes
  • ExponentiallyDecayingReservoir: quantiles weighting
  • Loosen type requirements for JmxAttributeGauge constructor
  • SlidingWindowReservoir - ArrayOutOfBoundsException thrown if # of Reservoir examples exceeds Integer max value
  • Classloader metrics
  • Add an instrumented ScheduledExecutorService
  • Fix race condition in InstrumentedThreadFactoryTest
  • Correct comparison of System.nanoTime in SlidingTimeWindowReservoir
  • Add SharedHealthCheckRegistries class
  • Migrate benchmarks from Caliper to JMH
  • New annotations: @CachedGauge, @Counted, @Metric
  • Support for annotations on classes and constructors
  • Allow @Metric on methods and parameters
  • Add @Inherited and @Documented on all type annotations
  • Adapted ehcache integration to latest ehcache version 2.8.3
  • Upgrade to HttpClient 4.3
  • InstrumentedHandler: Remove duplicate calls to requests.update(...)
  • New metric ‘utilization-max’ to track thread usage out of max pool size in jetty
  • Replaced Jetty-specific Request with Servlet API interfaces
  • Jetty 8: Avoid NPE if InstrumentedQueuedThreadPool gauges are read too early
  • Jetty 8: Call updateResponses onComplete of ContinuationListener
  • Allow specifying a custom prefix Jetty 9 InstrumentedHandler
  • MetricsModule is serializing wrong minute rates for timers
  • MeterSerializer.serialize had m1_rate and m15_rate transposed
  • Add CachedThreadStatesGaugeSet
  • Monitor count of deadlock threads
  • Prevent exceptions from ThreadDumpServlet on Google AppEngine
  • Upgrade to logback 1.1.1
  • Allow InstrumentedAppender use in logback.xml
  • Use getClass() in place of AbstractInstrumentedFilter.class in generated metric names
  • Update MetricsServlet with support for JSONP as alternative to CORS
  • Specify the base name of the metrics as a filter init-param for the metrics captured in the AbstractInstrumentedFilter
  • Add option to provide MetricFilter to MetricsServlet
  • AdminServlet generates link to pretty printed healthchecks
  • MetricsServlet.ContextListener doesn’t initialize the context correctly
  • Every reporter implements Reporter interface to indicate that is a Reporter
  • Added support for passing a ScheduledExecutorService to ScheduledReporters
  • Improve the ScheduledReporter#stop method
  • Ensure ScheduledReporters get unique thread pools.
  • Suppress runtime exceptions thrown from ScheduledReporter#report
  • Ability to inject a factory of ObjectName
  • Lazy fetch of PlatformMBeanServer
  • JMX Reporter throws exception when metric name contains an asterisk
  • onTimerRemoved in JmxListener calls registered.add
  • Support for mBean servers that rewrite the supplied ObjectName upon registration
  • Graphite reporter does not notify when Graphite/Carbon server is unreachable
  • Persistent connections to Graphite
  • Graphite constructor accepts host/port
  • Graphtie Pickle sender
  • Graphite UDP sender
  • Graphite AMQP sender
  • Add a threshold/minimum value to report before converting results to 0
  • Report to multiple gmetric instances
  • Escape slahes on ganglia metric names
  • Upgrade slf4j to 1.7.6
  • Enhancement for logging level option on Slf4jReporter

v3.0.1: Jul 23 2013

  • Fixed NPE in MetricRegistry#name.
  • ScheduledReporter and JmxReporter now implement Closeable.
  • Fixed cast exception for async requests in metrics-jetty9.
  • Added support for Access-Control-Allow-Origin to MetricsServlet.
  • Fixed numerical issue with Meter EWMA rates.
  • Deprecated AdminServletContextListener in favor of MetricsServlet.ContextListener and HealthCheckServlet.ContextListener.
  • Added additional constructors to HealthCheckServlet and MetricsServlet.

v3.0.0: June 10 2013

  • Renamed DefaultWebappMetricsFilter to InstrumentedFilter.
  • Renamed MetricsContextListener to InstrumentedFilterContextListener and made it fully abstract to avoid confusion.
  • Renamed MetricsServletContextListener to AdminServletContextListener and made it fully abstract to avoid confusion.
  • Upgraded to Servlet API 3.1.
  • Upgraded to Jackson 2.2.2.
  • Upgraded to Jetty 8.1.11.

v3.0.0-RC1: May 31 2013

  • Added SharedMetricRegistries, a singleton for sharing named metric registries.
  • Fixed XML configuration for metrics-ehcache.
  • Fixed XML configuration for metrics-jersey.
  • Fixed XML configuration for metrics-log4j.
  • Fixed XML configuration for metrics-logback.
  • Fixed a counting bug in metrics-jetty9‘s InstrumentedHandler.
  • Added MetricsContextListener to metrics-servlet.
  • Added MetricsServletContextListener to metrics-servlets.
  • Extracted the Counting interface.
  • Reverted SlidingWindowReservoir to a synchronized implementation.
  • Added the implementation version to the JAR manifests.
  • Made dependencies for all modules conform to Maven Enforcer’s convergence rules.
  • Fixed Slf4jReporter‘s logging of 99th percentiles.
  • Added optional name prefixing to GraphiteReporter.
  • Added metric-specific overrides of rate and duration units to JmxReporter.
  • Documentation fixes.

v3.0.0-BETA3: May 13 2013

  • Added ScheduledReporter#report() for manual reporting.
  • Fixed overly-grabby catches in HealthCheck and InstrumentedResourceMethodDispatchProvider.
  • Fixed phantom reads in SlidingWindowReservoir.
  • Revamped metrics-jetty9, removing InstrumentedConnector and improving the API.
  • Fixed OSGi imports for sun.misc.
  • Added a strategy class for HttpClient metrics.
  • Upgraded to Jetty 9.0.3.
  • Upgraded to Jackson 2.2.1.
  • Upgraded to Ehcache 2.6.6.
  • Upgraded to Logback 1.0.13.
  • Upgraded to HttpClient 4.2.5.
  • Upgraded to gmetric4j 1.0.3, which allows for host spoofing.

v3.0.0-BETA2: Apr 22 2013

  • Metrics is now under the com.codahale.metrics package, with the corresponding changes in Maven artifact groups. This should allow for an easier upgrade path without classpath conflicts.
  • MetricRegistry no longer has a name.
  • Added metrics-jetty9 for Jetty 9.
  • JmxReporter takes an optional domain property to disambiguate multiple reporters.
  • Fixed Java 6 compatibility problem. (Also added Java 6 as a CI environment.)
  • Added MetricRegistryListener.Base.
  • Switched Counter, Meter, and EWMA to use JSR133’s LongAdder instead of AtomicLong, improving contended concurrency.
  • Added MetricRegistry#buildMap(), allowing for custom map implementations in MetricRegistry.
  • Added MetricRegistry#removeMatching(MetricFilter).
  • Changed metrics-json to optionally depend on metrics-healthcheck.
  • Upgraded to Jetty 8.1.10 for metrics-jetty8.

v3.0.0-BETA1: Apr 01 2013

  • Total overhaul of most of the core Metrics classes:
    • Metric names are now just dotted paths like com.example.Thing, allowing for very flexible scopes, etc.
    • Meters and timers no longer have rate or duration units; those are properties of reporters.
    • Reporter architecture has been radically simplified, fixing many bugs.
    • Histograms and timers can take arbitrary reservoir implementations.
    • Added sliding window reservoir implementations.
    • Added MetricSet for sets of metrics.
  • Changed package names to be OSGi-compatible and added OSGi bundling.
  • Extracted JVM instrumentation to metrics-jvm.
  • Extracted Jackson integration to metrics-json.
  • Removed metrics-guice, metrics-scala, and metrics-spring.
  • Renamed metrics-servlet to metrics-servlets.
  • Renamed metrics-web to metrics-servlet.
  • Renamed metrics-jetty to metrics-jetty8.
  • Many more small changes!

v2.2.0: Nov 26 2012

  • Removed all OSGi bundling. This will be back in 3.0.
  • Added InstrumentedSslSelectChannelConnector and InstrumentedSslSocketConnector.
  • Made all metric names JMX-safe.
  • Upgraded to Ehcache 2.6.2.
  • Upgraded to Apache HttpClient 4.2.2.
  • Upgraded to Jersey 1.15.
  • Upgraded to Log4j 1.2.17.
  • Upgraded to Logback 1.0.7.
  • Upgraded to Spring 3.1.3.
  • Upgraded to Jetty 8.1.8.
  • Upgraded to SLF4J 1.7.2.
  • Replaced usage of Unsafe in InstrumentedResourceMethodDispatchProvider with type erasure trickery.

v2.1.5: Nov 19 2012

  • Upgraded to Jackson 2.1.1.

v2.1.4: Nov 15 2012

  • Added OSGi bundling manifests.

v2.1.3: Aug 06 2012

  • Upgraded to Apache HttpClient 4.2.1.
  • Changed InstrumentedClientConnManager to extend PoolingClientConnectionManager instead of the deprecated ThreadSafeClientConnManager.
  • Fixed a bug in ExponentiallyDecayingSample with long periods of inactivity.
  • Fixed problems with re-registering metrics in JMX.
  • Added support for DnsResolver instances to InstrumentedClientConnManager.
  • Added support for formatted health check error messages.

v2.1.2: Apr 11 2012

  • Fixed double-registration in metrics-guice.

v2.1.1: Mar 13 2012

  • Fixed instrumentation of all usages of InstrumentedHttpClient.

v2.1.0: Mar 12 2012

  • Added support for Java 7’s direct and mapped buffer pool stats in VirtualMachineMetrics and metrics-servlet.
  • Added support for XML configuration in metrics-ehcache.
  • metrics-spring now support @Gauge-annotated fields.
  • Opened GraphiteReporter up for extension.
  • Added group and type to metrics-annotations, metrics-guice, metrics-jersey, and metrics-spring.
  • Fixed handling of non-int gauges in GangliaReporter.
  • Fixed NullPointerException errors in metrics-spring.
  • General improvements to metrics-spring, including allowing custom Clock instances.

v2.0.3: Feb 24 2012

  • Change logging of InstanceNotFoundException exceptions thrown while unregistering a metric in JmxReporter to TRACE. It being WARN resulted in huge log dumps preventing process shutdowns when applications had ~1K+ metrics.
  • Upgraded to Spring 3.1.1 for metrics-spring.
  • Upgraded to JDBI 2.31.2.
  • Upgraded to Jersey 1.12.
  • Upgraded to Jetty 7.6.1.
  • Fixed rate units for meters in GangliaReporter.

v2.0.2: Feb 09 2012

  • InstrumentationModule in metrics-guice now uses the default MetricsRegistry and HealthCheckRegistry.

v2.0.1: Feb 08 2012

  • Fixed a concurrency bug in JmxReporter.

v2.0.0: Feb 07 2012

  • Upgraded to Jackson 1.9.4.
  • Upgraded to Jetty 7.6.0.
  • Added escaping for garbage collector and memory pool names in GraphiteReporter.
  • Fixed the inability to start and stop multiple reporter instances.
  • Switched to using a backported version of ThreadLocalRandom for UniformSample and ExponentiallyDecayingSample to reduce lock contention on random number generation.
  • Removed Ordered from TimedAnnotationBeanPostProcessor in metrics-spring.
  • Upgraded to JDBI 2.31.1.
  • Upgraded to Ehcache 2.5.1.
  • Added #timerContext() to Scala Timer.

v2.0.0-RC0: Jan 19 2012

  • Added FindBugs checks to the build process.
  • Fixed the catching of Error instances thrown during health checks.
  • Added enable static methods to CsvReporter and changed CsvReporter(File, MetricsRegistry) to CsvReporter(MetricsRegistry, File).
  • Slimmed down InstrumentedEhcache.
  • Hid the internals of GangliaReporter.
  • Hid the internals of metrics-guice.
  • Changed metrics-httpclient to consistently associate metrics with the org.apache class being extended.
  • Hid the internals of metrics-httpclient.
  • Rewrote InstrumentedAppender in metrics-log4j. It no longer forwards events to an appender. Instead, you can just attach it to your root logger to instrument logging.
  • Rewrote InstrumentedAppender in metrics-logback. No major API changes.
  • Fixed bugs with @ExceptionMetered-annotated resource methods in metrics-jersey.
  • Fixed bugs generating Snapshot instances from concurrently modified collections.
  • Fixed edge case in MetricsServlet‘s thread dumps where one thread could be missed.
  • Added RatioGauge and PercentGauge.
  • Changed InstrumentedQueuedThreadPool‘s percent-idle gauge to be a ratio.
  • Decomposed MetricsServlet into a set of focused servlets: HealthCheckServlet, MetricsServlet, PingServlet, and ThreadDumpServlet. The top-level servlet which provides the HTML menu page is now AdminServlet.
  • Added metrics-spring.

v2.0.0-BETA19: Jan 07 2012

  • Added absolute memory usage to MetricsServlet.
  • Extracted @Timed etc. to metrics-annotations.
  • Added metrics-jersey, which provides a class allowing you to automatically instrument all @Timed, @Metered, and @ExceptionMetered-annotated resource methods.
  • Moved all classes in metrics-scala from com.yammer.metrics to com.yammer.metrics.scala.
  • Renamed CounterMetric to Counter.
  • Renamed GaugeMetric to Gauge.
  • Renamed HistogramMetric to Histogram.
  • Renamed MeterMetric to Meter.
  • Renamed TimerMetric to Timer.
  • Added ToggleGauge, which returns 1 the first time it’s called and 0 every time after that.
  • Now licensed under Apache License 2.0.
  • Converted VirtualMachineMetrics to a non-singleton class.
  • Removed Utils.
  • Removed deprecated constructors from Meter and Timer.
  • Removed LoggerMemoryLeakFix.
  • DeathRattleExceptionHandler now logs to SLF4J, not syserr.
  • Added MetricsRegistry#groupedMetrics().
  • Removed Metrics#allMetrics().
  • Removed Metrics#remove(MetricName).
  • Removed MetricsRegistry#threadPools() and #newMeterTickThreadPool() and added #newScheduledThreadPool.
  • Added MetricsRegistry#shutdown().
  • Renamed ThreadPools#shutdownThreadPools() to #shutdown().
  • Replaced HealthCheck‘s abstract name method with a required constructor parameter.
  • HealthCheck#check() is now protected.
  • Moved DeadlockHealthCheck from com.yammer.metrics.core to com.yammer.metrics.utils.
  • Added HealthCheckRegistry#unregister(HealthCheck).
  • Fixed typo in VirtualMachineMetrics and MetricsServlet: commited to committed.
  • Changed MetricsRegistry#createName to protected.
  • All metric types are created exclusively through MetricsRegistry now.
  • Metrics.newJmxGauge and MetricsRegistry.newJmxGauge are deprecated.
  • Fixed heap metrics in VirtualMachineMetrics.
  • Added Snapshot, which calculates quantiles.
  • Renamed Percentiled to Sampling and dropped percentile and percentiles in favor of producing Snapshot instances. This affects both Histogram and Timer.
  • Renamed Summarized to Summarizable.
  • Changed order of CsvReporter‘s construction parameters.
  • Renamed VirtualMachineMetrics.GarbageCollector to VirtualMachineMetrics.GarbageCollectorStats.
  • Moved Guice/Servlet support from metrics-servlet to metrics-guice.
  • Removed metrics-aop.
  • Removed newJmxGauge from both Metrics and MetricsRegistry. Just use JmxGauge.
  • Moved JmxGauge to com.yammer.metrics.util.
  • Moved MetricPredicate to com.yammer.metrics.core.
  • Moved NameThreadFactory into ThreadPools and made ThreadPools package-visible.
  • Removed Timer#values(), Histogram#values(), and Sample#values(). Use getSnapshot() instead.
  • Removed Timer#dump(File) and Histogram#dump(File), and Sample#dump(File). Use Snapshot#dump(File) instead.

v2.0.0-BETA18: Dec 16 2011

  • Added DeathRattleExceptionHandler.
  • Fixed NPE in VirtualMachineMetrics.
  • Added decorators for connectors and thread pools in metrics-jetty.
  • Added TimerMetric#time() and TimerContext.
  • Added a shorter factory method for millisecond/second timers.
  • Switched tests to JUnit.
  • Improved logging in GangliaReporter.
  • Improved random number generation for UniformSample.
  • Added metrics-httpclient for instrumenting Apache HttpClient 4.1.
  • Massively overhauled the reporting code.
  • Added support for instrumented, non-public methods in metrics-guice.
  • Added @ExceptionMetered to metrics-guice.
  • Added group prefixes to GangliaReporter.
  • Added CvsReporter, which outputs metric values to .csv files.
  • Improved metric name sanitization in GangliaReporter.
  • Added Metrics.shutdown() and improved metrics lifecycle behavior.
  • Added metrics-web.
  • Upgraded to ehcache 2.5.0.
  • Many, many refactorings.
  • metrics-servlet now responds with 501 Not Implememented when no health checks have been registered.
  • Many internal refactorings for testability.
  • Added histogram counts to metrics-servlet.
  • Fixed a race condition in ExponentiallyDecayingSample.
  • Added timezone and locale support to ConsoleReporter.
  • Added metrics-aop for Guiceless support of method annotations.
  • Added metrics-jdbi which adds instrumentation to JDBI.
  • Fixed NPE for metrics which belong to classes in the default package.
  • Now deploying artifacts to Maven Central.

v2.0.0-BETA17: Oct 07 2011

  • Added an option message to successful health check results.
  • Fixed locale issues in GraphiteReporter.
  • Added GangliaReporter.
  • Added per-HTTP method timers to InstrumentedHandler in metrics-jetty.
  • Fixed a thread pool leak for meters.
  • Added #dump(File) to HistogramMetric and TimerMetric.
  • Upgraded to Jackson 1.9.x.
  • Upgraded to slf4j 1.6.2.
  • Upgraded to logback 0.9.30.
  • Upgraded to ehcache 2.4.5.
  • Surfaced Metrics.removeMetric().

v2.0.0-BETA16: Aug 23 2011

  • Fixed a bug in GC monitoring.

v2.0.0-BETA15: Aug 15 2011

  • Fixed dependency scopes for metrics-jetty.
  • Added time and VM version to vm output of MetricsServlet.
  • Dropped com.sun.mangement-based GC instrumentation in favor of a one. getLastGcInfo has a nasty native memory leak in it, plus it often returned incorrect data.
  • Upgraded to Jackson 1.8.5.
  • Upgraded to Jetty 7.4.5.
  • Added sanitization for metric names in GraphiteReporter.
  • Extracted out a Clock interface for timers for non-wall-clock timing.
  • Extracted out most of the remaining statics into MetricsRegistry and HealthCheckRegistry.
  • Added an init parameter to MetricsServlet for disabling the jvm section.
  • Added a Guice module for MetricsServlet.
  • Added dynamic metric names.
  • Upgraded to ehcache 2.4.5.
  • Upgraded to logback 0.9.29.
  • Allowed for the removal of metrics.
  • Added the ability to filter metrics exposed by a reporter to those which match a given predicate.

v2.0.0-BETA14: Jul 05 2011

  • Moved to Maven for a build system and extracted the Scala façade to a metrics-scala module which is now the only cross-built module. All other modules dropped the Scala version suffix in their artifactId.
  • Fixed non-heap metric name in GraphiteReporter.
  • Fixed stability error in GraphiteReporter when dealing with unavailable servers.
  • Fixed error with anonymous, instrumented classes.
  • Fixed error in MetricsServlet when a gauge throws an exception.
  • Fixed error with bogus GC run times.
  • Link to the pretty JSON output from the MetricsServlet menu page.
  • Fixed potential race condition in histograms’ variance calculations.
  • Fixed memory pool reporting for the G1 collector.

v2.0.0-BETA13: May 13 2011

  • Fixed a bug in the initial startup phase of the JmxReporter.
  • Added metrics-ehcache, for the instrumentation of Ehcache instances.
  • Fixed a typo in metrics-jetty‘s InstrumentedHandler.
  • Added name prefixes to GraphiteReporter.
  • Added JVM metrics reporting to GraphiteReporter.
  • Actually fixed MetricsServlet‘s links when the servlet has a non-root context path.
  • Now cross-building for Scala 2.9.0.
  • Added pretty query parameter for MetricsServlet to format the JSON object for human consumption.
  • Added no-cache headers to the MetricsServlet responses.

v2.0.0-BETA12: May 09 2011

  • Upgraded to Jackson 1.7.6.
  • Added a new instrumented Log4J appender.
  • Added a new instrumented Logback appender. Thanks to Bruce Mitchener (@waywardmonkeys) for the patch.
  • Added a new reporter for the Graphite aggregation system. Thanks to Mahesh Tiyyagura (@tmahesh) for the patch.
  • Added scoped metric names.
  • Added Scala 2.9.0.RC{2,3,4} as build targets.
  • Added meters to Jetty handler for the percent of responses which have 4xx or 5xx status codes.
  • Changed the Servlet API to be a provided dependency. Thanks to Mårten Gustafson (@chids) for the patch.
  • Separated project into modules:
    • metrics-core: A dependency-less project with all the core metrics.
    • metrics-graphite: A reporter for the [Graphite]( aggregation system.
    • metrics-guice: Guice AOP support.
    • metrics-jetty: An instrumented Jetty handler.
    • metrics-log4j: An instrumented Log4J appender.
    • metrics-logback: An instrumented Logback appender.
    • metrics-servlet: The Metrics servlet with context listener.

v2.0.0-BETA11: Apr 27 2011

  • Added thread state and deadlock detection metrics.
  • Fix VirtualMachineMetrics‘ initialization.
  • Context path fixes for the servlet.
  • Added the @Gauge annotation.
  • Big reworking of the exponentially-weighted moving average code for meters. Thanks to JD Maturen (@sku) and John Ewart (@johnewart) for pointing this out.
  • Upgraded to Guice 3.0.
  • Upgraded to Jackson 1.7.5.
  • Upgraded to Jetty 7.4.0.
  • Big rewrite of the servlet’s thread dump code.
  • Fixed race condition in ExponentiallyDecayingSample. Thanks to Martin Traverso (@martint) for the patch.
  • Lots of spelling fixes in Javadocs. Thanks to Bruce Mitchener (@waywardmonkeys) for the patch.
  • Added Scala 2.9.0.RC1 as a build target. Thanks to Bruce Mitchener (@waywardmonkeys) for the patch.
  • Patched a hilarious memory leak in java.util.logging.

v2.0.0-BETA10: Mar 25 2011

  • Added Guice AOP annotations: @Timed and @Metered.
  • Added HealthCheck#name().
  • Added Metrics.newJmxGauge().
  • Moved health checks into HealthChecks.
  • Upgraded to Jackson 1.7.3 and Jetty 7.3.1.

v2.0.0-BETA9: Mar 14 2011

  • Fixed JmxReporter lag.
  • Added default arguments to timers and meters.
  • Added default landing page to the servlet.
  • Improved the performance of ExponentiallyDecayingSample.
  • Fixed an integer overflow bug in UniformSample.
  • Added linear scaling to ExponentiallyDecayingSample.

v2.0.0-BETA8: Mar 01 2011

  • Added histograms.
  • Added biased sampling for timers.
  • Added dumping of timer/histogram samples via the servlet.
  • Added dependency on jackon-mapper.
  • Added classname filtering for the servlet.
  • Added URI configuration for the servlet.

v2.0.0-BETA7: Jan 12 2011

  • Added JettyHandler.
  • Made the Servlet dependency optional.

v2.0.0-BETA6: Jan 12 2011

  • Fix JmxReporter initialization.

v2.0.0-BETA5: Jan 11 2011

  • Dropped Counter#++ and Counter#--.
  • Added Timer#update.
  • Upgraded to Jackson 1.7.0.
  • Made JMX reporting implicit.
  • Added health checks.

v2.0.0-BETA3: Dec 23 2010

  • Fixed thread names and some docs.

v2.0.0-BETA2: Dec 22 2010

  • Fixed a memory leak in MeterMetric.

v2.0.0-BETA1: Dec 22 2010

  • Total rewrite in Java.

v1.0.7: Sep 21 2010

  • Added median to Timer.
  • Added p95 to Timer (95th percentile).
  • Added p98 to Timer (98th percentile).
  • Added p99 to Timer (99th percentile).

v1.0.6: Jul 15 2010

  • Now compiled exclusively for 2.8.0 final.

v1.0.5: Jun 01 2010

  • Documentation fix.
  • Added TimedToggle, which may or may not be useful at all.
  • Now cross-building for RC2 and RC3.

v1.0.4: Apr 27 2010

  • Blank Timer instances (i.e., those which have recorded no timings yet) no longer explode when asked for metrics for that which does not yet exist.
  • Nested classes, companion objects, and singletons don’t have trailing $ characters messing up JMX’s good looks.

v1.0.3: Apr 16 2010

  • Fixed some issues with the plumbing.
  • Tweaked the sample size for Timer, giving it 99.9% confidence level with a %5 margin of error (for a normally distributed variable, which it almost certainly isn’t.)
  • Sample#iterator returns only the recorded data, not a bunch of zeros.
  • Moved units of Timer, Meter, and LoadMeter to their own attributes, which allows for easy export of Metrics data via JMX to things like Ganglia or whatever.

v1.0.2: Mar 08 2010

  • Timer now uses Welford’s algorithm for calculating running variance, which means no more hilariously wrong standard deviations (e.g., NaN).
  • Timer now supports +=(Long) for pre-recorded, nanosecond-precision timings.

v1.0.1: Mar 05 2010

  • changed Sample to use an AtomicReferenceArray

v1.0.0: Feb 27 2010

  • Initial release