I thought this was cool but didn't look at the details on it when it came out, it's even cooler than I thought, stack traces at arbitrary break points in cloud services running live with near zero overhead: "Now you can simply pick a line of code, set a watchpoint and the debugger will return local variables and a full stack trace from the next request that executes that line on any replica of your service. There is zero setup time, no complex configurations and no performance impact noticeable to your users. ... Cloud Debugger watches execution on all instances and as soon as one hits the condition the debugger stops watching on all other instances ... The debugger pauses execution at the appropriate line of execution, snapshots the stack and local variables then returns execution to the normal flow. The overhead is minimal and limited."
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