Improvements

• Add resourceName as optional field to @Trace #925
• Support log trace injection for log4j 1.x and log4j 2.x #894
  • dd.logs.injection.enabled=true still required.
  • See docs for more details.
• Add instrumentation for Google Http Client #914
• Add instrumentation for Spring 5 WebClient #831 (Thanks to @johanvandeweerd for the contribution.)
• Collect container-id if available #920
• Better support for Akka-http with Scala 2.13 #899 (Thanks to @dpratt for the contribution.)
• Improved hostname detection #927
• More extensive testing on various JVM's #902
• Extend support for Jersey client to 1.9+ #910
• Add instrumentation for Kafka client using records(TopicPartition) method #911
• Improved handling around tracing Kafka's Iterator: #924 (Thanks to @gygabyte for the contribution.)

Fixes

• Allow proper shutdown of applications by marking JMXFetch threads as daemon #905
• Change parent scope context propagation for Netty clients' callback #886
• Better handling for adding Netty tracing handlers #900
• Remove "default instance" for SqlServer #916
• Assert that Span isn't set as null in Scope #917