@Override
    public Number lookup(String name) {
        int t = dictionary.getOrDefault(name, -1);
        if (t < 0) {
            t = dictionary.getOrDefault("default", -1);
        }
        if (t < 0) {
            log.warn("Pick up system reserved threshold {}ms because of config missing", SYSTEM_RESERVED_THRESHOLD);
            return SYSTEM_RESERVED_THRESHOLD;
        }
        if (log.isDebugEnabled()) {
            log.debug("Apdex threshold of {} is {}ms", name, t);
        }
        return t;
    }
Apdex threshold configuration dictionary adapter. Looking up a service apdex threshold from dynamic config service.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/ApdexThresholdConfig.java