@Override
            public void getConfig(ProtonConfig.Builder builder) {
                if (io != null) io.getConfig(builder);
                if (warmup != null) warmup.getConfig(builder);
            }
Class representing the tuning config used for a search cluster.
Take a look at proton.def and vespa doc for detailed explanations.

@author geirst
config-model/src/main/java/com/yahoo/vespa/model/search/Tuning.java