Improvements

• Consistent error messaging for profiling startup #1731
• Serverless support for tracing through logging #1715, #1733
• JUnit4 Instrumentation #1683
• Add DD tags to log instrumentations #1688
• Log startup status #1660
• Service Name Detection from jar name #1680
• Add guard to prevent UDS configuration on windows env #1716

Performance

• Cache kafka and hystrix resource names #1730, #1729
• Don't cache classloaders which can be skipped by name #1732
• Alternative context extraction #1686
• Small tweaks to tags map in DDSpanContext #1655

Fixes

• Move Spring Scheduling RunnableWrapper to fix Spring Sleuth interop #1717
• Use spring-webflux-5.1+ ClientResponse.rawStatusCode when available #1711
• Fix Spring filter instrumentation edge case #1700
• Enable Async Propagation of trace in Kafka producer callback #1727
• Don't double count baggage overridden by tag #1721
• Prevent packer's buffer from getting into unmarked state #1718
• [Community] Fix multi-threaded classloading of DataDog agent classes #1681 (Thanks @mc1arke for the contribution!)
• [Community] Check for error condition before setting ERROR_MSG #1703 (Thanks @jfklingler for the contribution!)