Note: This release was published with a broken dependency for dd-trace-ot. This is fixed in 0.55.1.

Breaking Changes

• Extract Config into Deprecated and Non-Deprecated parts #1577
  • This mainly applies to users of dd-trace-ot that were passing in a Config instance to DDTracer.
  • Note: The Config class in dd-trace-api should no longer be used directly. All config should be done via system properties, environment variables, properties file, or a Properties instance with dd-trace-ot.
• Span Decorators are no longer accessible #1565
  • These were actually removed with the separation from OpenTracing, but this hides it further.

Improvements

• Add support for Play 2.8.x #1521 (Thanks @keki for the contribution!)
• Improve trace rule processing performance #1551

Performance

• Improve performance of JFR scope events #1538 #1550
• Avoid converting IDs to BigIntegers #1568
• Increase trace buffer size to avoid overflow allocation #1571
• Create context store map at most once #1570
• Avoid creating new strings prior to jar lookup #1580
• Avoid list allocation during super type matching #1578

Changes

• Increase agent communication timeouts and add more logging #1590
• Sample all exceptions for Profiling #1559
• Add container id header to profile uploads #1569

Fixes

• Regression in 0.54.0 in OpenTracing addReference usage #1572
• Play-ws avoid instrumenting websocket upgrade handlers #1567 (Thanks @mrooneytrimble for the contribution!)
• ApacheHttpClient headers copied on redirect #1539
• Fix future cancelation task cleanup #1555
• Send data to trace agent when no API key is given #1543
• Disable agent if we may append wrong jar to boot classpath #1561
• Allow OkHttp client to start when TLS is not configured #1582