private Map<String, Integer> stateMetrics() {
        LoadLevel current = currentLoadLevel();
        for (LoadLevel level : LoadLevel.values()) {
            int value = level.equals(current) ? current.ordinal() : -1;
            stateMetrics.put(level.name(), value);
        }
        return stateMetrics;
    }
Get the current load level of the system, which is, the maximum load level from all checkers.
core/src/main/java/kafka/automq/backpressure/DefaultBackPressureManager.java