Improvements

• Experimental instrumentation for the OpenTelemetry Tracing API #1605
  • To enable use:
    • Java System Property: -Ddd.integration.opentelemetry-beta.enabled=true or
    • Environment Variable: DD_INTEGRATION_OPENTELEMETRY_BETA_ENABLED=true
• Handle kafka tombstones #1622
• Inject dd.service dd.version dd.env in MDC/Thread local context logs #1579

Performance

• add missing classloader matchers for expensive matchers #1617
• Optimization for expensive type matcher #1616
• Exclude JDK class references at build time, reduce allocation in ReferenceMatcher #1613
• do not eagerly load classfiles at startup #1606
• Cache Strings in DBTypeTagInterceptor #1603
• route classloads to classloader by package #1598
• shorten jar names (prefixes of runtime classnames) #1592
• Change LZ4 config to reduce allocation rate during decompression #1464

Changes

• Don't instrument org.apache.logging.log4j.ThreadContext's ThreadLocal field in case Log4j-to-SLF4J Adapter detected #1626
• Remove confusing DDAgentApi toString #1615
• Remove anonymous classes from JMSDecorator #1612
• remove anonymous class from spring webmvc-3.1 #1611
• Use request path for Jetty resource name #1608
• Revert eager creation of Datadog Agent client socket #1602
• move okhttp + transitives to shared classloader #1591

Fixes

• discrepancy between exception histo and sample events #1600
• avoid adding class which will be relocated to helper classes #1596
• Spring handler mapping affecting character encoding #1595
• Properly handle configuration exception when profiling is initialized #1593
• Force cleartext connspec in the ProfilingUploader client #1586