Q: A specific application binary is randomly spinning up CPU. You run `strace -p <PID>` to see what system calls it's making, but attaching `strace` slows the application down so severely it almost crashes in production. What modern alternative provides identical visibility without the penalty?

strace relies on the ptrace system call. Every single time the application tries to do anything, ptrace forces the kernel to pause the application, do a context switch to the strace user-space tool, print the log, and context switch back. In heavily trafficked environments, this 10x overhead cripples the app. The modern SRE alternative is eBPF (specifically using tools like bpftrace or BCC tools). eBPF runs a highly optimized, sandboxed program directly inside the kernel. It intercepts the sys-calls securely at the kernel level, aggregates the data in memory, and only passes the summarized findings back to user space asynchronously. The overhead is virtually zero, making it completely safe for profiling high-load production servers.