What Code Instrumentation Actually Is Instrumentation means adding extra code not to change your app’s functionality, but to observe it. Think logs, counters, spans, metrics.

Defining the Tools Let’s keep it simple: a profiler watches what your application does over time. It measures stuff CPU usage, memory leaks, disk I/O,

What Race Conditions Really Mean Imagine two people trying to write on the same whiteboard at the same time. One writes a sentence, the other

Setting the Stage Crash logs aren’t just digital debris they’re storyboards of real failure. Unlike contrived bug examples or textbook exercises, real world crash logs

What Breakpoints Really Do at Runtime Setting a breakpoint looks simple on the surface just click the margin, and the IDE drops a red dot.