Fixed swapped m1 and m15 rates in MetricsModule

Remove duplicate update in Jetty9 InstrumentedHandler

Call updateResponses and decrement suspended requests in Jetty8 InstrumentedHandler

JmxReporter didn’t properly remove timers

Servlets call super#init

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.

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.

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.

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.

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.

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!

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.

Upgraded to Jackson 2.1.1.

Added OSGi bundling manifests.

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.

Fixed double-registration in metrics-guice.

Fixed instrumentation of all usages of InstrumentedHttpClient.

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.

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.

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

Fixed a concurrency bug in JmxReporter.

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.

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.

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.

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.

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().

Fixed a bug in GC monitoring.

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 java.lang.management-based 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.

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.

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.

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](http://graphite.wikidot.com) 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.

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.

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.

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.

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.

Added JettyHandler.

Made the Servlet dependency optional.

Fix JmxReporter initialization.

Dropped Counter#++ and Counter#--.

Added Timer#update.

Upgraded to Jackson 1.7.0.

Made JMX reporting implicit.

Added health checks.

Fixed thread names and some docs.

Fixed a memory leak in MeterMetric.

Total rewrite in Java.

Added median to Timer.

Added p95 to Timer (95th percentile).

Added p98 to Timer (98th percentile).

Added p99 to Timer (99th percentile).

Now compiled exclusively for 2.8.0 final.

Documentation fix.

Added TimedToggle, which may or may not be useful at all.

Now cross-building for RC2 and RC3.

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.

Fixed some issues with the implicit.ly 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.

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.

changed Sample to use an AtomicReferenceArray

Initial release