Known Issues

• Under heavy load the writing of spans might throw an exception due to a mismatch in the counting of the finished spans #2076. Fix slated for v0.68.0

Improvements

• Permit space-separated tags in config #2011
• Better field injection (for context propagation) #2004 #2007

Changes

• Fail-fast if creating DDTracer when using dd-java-agent #1994
• Add setters to span.metrics from MutableSpan #1985
• Enable health metrics by default #1871
• Exclude internal agent threads from exception profiling #1998
• Small efficiency improvements in play 2.6 instrumentation #1996

Fixes

• Add missing equals and hashCode method into datadog.trace.instrumentation.opentracing32.OTSpan #1995 (Thanks @ygree for the contribution!)
• Ensure ForkJoinTask is field-injected (leads to significant memory savings in applications using the Java Fork Join Pool) #1993
• More reliable context propagation for Scala 2.13 #2015