public static void copyAll(RequestContext ctx) {
        requireNonNull(ctx, "ctx");
        checkState(delegate != null, ERROR_MESSAGE);
        final Map<String, String> map = getDelegateContextMap();
        if (map != null) {
            putAll(ctx, map);
        }
    }
Copies all thread-local {@link MDC} properties to the specified {@link RequestContext}.

@param ctx the {@link RequestContext}
core/src/main/java/com/linecorp/armeria/common/logging/RequestScopedMdc.java