4 Runtime

Runtime {#runtime}

<!-- CL 742580 -->

Tracebacks for modules with go directives configuring Go 1.27 or later will now include runtime/pprof goroutine labels in the header line. This behavior can be disabled with GODEBUG=tracebacklabels=0 (added in Go 1.26). This opt-out is expected to be kept indefinitely in case goroutine labels acquire sensitive information that shouldn't be made available in tracebacks.