Tag
watchdog
- Dec 16, 2024 Alerting on Absent and Stale Data Why a missing series makes an alert rule evaluate to nothing rather than to health, how staleness markers and absence functions expose the difference, and why a firing alert can silently turn into a false resolution. observability
- Jul 5, 2024 Windowed Watchdogs and the Program-Flow Contract Why a watchdog that accepts a refresh too early is as dangerous as one that never fires, how the window and the sequence check constrain the timing, and where the supervision must live to be independent. embedded systems
- Dec 13, 2021 Trial Boot, Confirmation, and Automatic Rollback How a new image is allowed to run under supervision, what counts as proof that it works, and why the confirmation step has to come from the application rather than the bootloader. embedded systems