The default logging driver writes to a file that grows without bound, so a chatty container fills the host disk over a fortnight and nothing warns first. Setting…
PID 1 in Linux gets no default signal handlers, so a shell script as the entrypoint ignores SIGTERM entirely and docker stop waits ten seconds before killing it.…
A responsive card grid was a set of breakpoints each restating the column count, which is four rules describing one intention. The min(16rem, 100%) is the part usually…
An instrumenting profiler records every call, which changes the timings it is measuring — small fast functions look disproportionately expensive because the overhead is per call. Sampling belongs…
The numerator and the denominator are both decisions, and getting the denominator wrong is what makes an objective meaningless. Excluding health checks and monitoring traffic is uncontroversial and…
An effect with an empty dependency array captures the first render’s variables permanently, so a timer set up once reads values that stopped being current seconds later. A…
February brought the removals that 8 had warned about for a year, and a suite that ignored the warnings does not run at all. Rector handles the mechanical…
A deduplication table is a check bolted on afterwards, and some operations are naturally repeatable — which is better, because there is nothing to get wrong. Designing the…