What trade‑offs define effective rate‑limited alert thresholds in resource‑constrained embedded C firmware?

In embedded C firmware, alert mechanisms must distinguish critical warnings from routine status updates while operating under strict memory and CPU constraints. A common approach involves rate‑limited alert counters that suppress duplicate notifications within a configurable time window, but the optimal threshold configuration remains context‑dependent across typical ARM Cortex‑M toolchains and compiler configurations.

Key constraints include ISR safety, where logging or timer operations may introduce priority inversion, and the need to avoid excessive false positives that degrade system reliability. General practice involves measuring interrupt latency and alert frequency under simulated workloads to assess threshold behavior, though no universal standard quantifies the window‑duration‑severity relationship.

What severity‑based weighting scheme preserves critical warnings while suppressing low‑priority repeats? How should the alert window duration scale with interrupt frequency? Which dynamic threshold adjustment strategy maintains effectiveness across varying workload patterns?