• Compiled and targeted Java8
• Move JMX classes to the metrics-jmx module
• Fix a racy read bug in EWMA
• Use Java 8 Time API for data formatting of health checks
• Remove unnecessary reflection hacks for HealthCheckRegistry
• Removed metrics-log4j
• Removed metrics-jetty9-legacy
• Removed metrics-jetty8
• Removed metrics-jersey
• Removed metrics-ganglia
• Removed internal LongAdder
• Removed internal ThreadLocalRandom
• Optimized generating random numbers
• Timer.Context now implements AutoCloseable
• Upgrade Jetty integration to Jetty 9.4