| ## Runtime {#runtime} | |
| <!-- CL 742580 --> | |
| Tracebacks for modules with `go` directives configuring Go 1.27 or later will now | |
| include [runtime/pprof](https://pkg.go.dev/runtime/pprof) goroutine labels in | |
| the header line. This behavior can be disabled with `GODEBUG=tracebacklabels=0` | |
| (added in [Go 1.26](/doc/godebug#go-126)). This opt-out is expected to be | |
| kept indefinitely in case goroutine labels acquire sensitive information that | |
| shouldn't be made available in tracebacks. |