@Override
    protected boolean removeEldestEntry(Map.Entry<T, U> eldest) {
        return size() > maxEntries;
    }
Returns {@code true} if the {@link #size()} of this map exceeds the maximum number of allowed entries.
Invoked by {@link LinkedHashMap} for LRU behavior.
core/src/main/java/com/linecorp/armeria/common/util/LruMap.java