void failOnOverload() {
            try (ResourceReference reference = requestReference) {
                incrementRejectedRequests();
                logRejectedRequests();
                writeErrorResponseOnOverload(request, responseHandler);
            }
        }
Clean up when the task can not be executed because no worker thread is available.
container-core/src/main/java/com/yahoo/container/jdisc/ThreadedRequestHandler.java