private void initialize() {
        portsMeta.on(0).tag("messaging");
        portsMeta.on(1).tag("rpc").tag("status");
        portsMeta.on(2).tag("http").tag("status").tag("state");
    }
Common class for config producers for storage and distributor nodes.
config-model/src/main/java/com/yahoo/vespa/model/content/ContentNode.java