1.68.1

Components

Profiling

• 🐛 Bump java-profiler (ddprof) to 1.52.1 (#13137 - @jbachorik)
  • Measure native allocator overhead instead of assuming a fixed factor
  • Improve stack frame attribution and AArch64 runtime stub unwinding
  • Record the remote symbolication mode in JFR
  • Add upstream reference-chain tracking and leak-signal detection, with liveness and recycled-tag identity fixes
  • Fix dictionary and call-trace table reclamation after drain timeouts, preserve string IDs across dictionary rotation, and correct live-trace preservation
  • Fix duplicate and biased thread selection in wall-clock sampling, native socket hook timestamps, and continuation metadata lookup and frame alignment
  • Add the upstream fjmethodid=lazy option for profiling HotSpot without jmethodIDs

Tracer core

• 🐛 Fix stale type descriptions when transforming multi-release classes (#13134 - @mcculls)

Instrumentations

Netty instrumentation

• 🐛 Fix Netty client disconnects being reported as trace errors (#13168 - @ygree)