Improvements

• Better trace propagation for servlet forward/sendError calls #1065 #1066

Changes

• Updated jnr-unixsocket to 0.23 #1068
• Added health metrics tracking via dogstatsd #1063
  • Disabled by default. To enable, add one of the following configs:
    • System Property: -Ddd.trace.health.metrics.enabled=true
    • Environment Variable: DD_TRACE_HEALTH_METRICS_ENABLED=true
• Refactor integrations to decouple from OpenTracing #1020 #1026 (Thanks @trask for the contributions.)

Fixes

• dd-trace-ot compatibility with OpenTracing 0.33.0 #1070
• Spring data repository integration #1054
• Prevent Spring Controller & DropWizard spans from being root spans. #1060
• Better handling for Spring Controller and Jax-rs controller spans. #1064