• 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
• Support for asynchronous health checks #1077
• Added a listener for health checks. #1068
• 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