silent failures
2 articles about "silent failures".
A Validation Check One Line Too Late Doesn't Raise, It Becomes Decoration: Four Silent Failures in chainladder's predict
predict in the actuarial library chainladder-python still returns a result for four kinds of mismatched input: 775 rows go in and 643 come out, 6 rows go in and 775 come out, one row's pattern applied to another row comes out 38% short, and a paid pattern applied to incurred data overstates by 52%, all without an error message. This post unpacks two input-validation lessons from our fix, PR #1310: legitimate and dangerous looseness look identical in the data, so look for a marker the system writes itself; and a check placed after the line that rewrites its input does not raise, it goes blind in exactly the case it most needs to see.
The Dashboard Said Running. The Service Had Done Nothing All Night: Four Silent Failures in Automation Monitoring
A running flag that was always false, a heartbeat that measured presence instead of work, alert dedup that muted a real outage, and an auto-stop with no auto-resume. Four real bugs from our automation fleet, each with the broken check, why it lied, and the check that replaced it.