List<DelayedConfigResponse> allDelayedResponses() {
        List<DelayedConfigResponse> responses = new ArrayList<>();
        for (Map.Entry<ApplicationId, BlockingQueue<DelayedConfigResponse>> entry : delayedResponses.entrySet()) {
            responses.addAll(entry.getValue());
        }
        return responses;
    }
Takes care of <i>delayed responses</i> in the config server.
A delayed response is a response sent at request (server) timeout
for a config which has not changed since the request was initiated.

@author hmusum
configserver/src/main/java/com/yahoo/vespa/config/server/rpc/DelayedConfigResponses.java