I'd put tracing tools (dtrace, eBPF, etc.) in the same category. Many bugs only happen in production, and you can't run a debugger. The might also be triggered

I'd put tracing tools (dtrace, eBPF, etc.) in the same category. Many bugs only happen in production, and you can't run a debugger. The might also be triggered in some way such that they don't happen when stepping through code, for example race conditions or network faults.