@Deprecated
    @Override
    default <V> Function<V, LogLevel> compose(Function<? super V, ? extends RequestOnlyLog> before) {
        throw new UnsupportedOperationException();
    }
Returns a composed function that first applies the before function to its input, and then applies this
function to the result. If evaluation of either function throws an exception, it is relayed to the
caller of the composed function.

@deprecated Do not use this method.
core/src/main/java/com/linecorp/armeria/common/logging/RequestLogLevelMapper.java