Setting up Logging with Sumo Logic - which Host should I use?

[#1]

I was working on adding some MessageLogging policies to our Apigee proxies but am currently stuck on the Host configuration.. I have set up a Sumo Logic account and configured a Syslog Collector by following the instructions here:

http://help.sumologic.com/Help/#Configuring_a_Syslog_Source.htm%3FTocPath%3DSources%7CConfiguring%25...

Notice that there is no field to configure Host in the collector. Here's what my MessageLogging policy looks like (I don't know what to put between the <Host> tags)

<MessageLogging name="log-to-syslog"> 
  <Syslog> 
    <Message>
      "{organization.name}.{apiproxy.name}.{environment.name}"
    </Message>
    <Host>???</Host> 
    <Port>514</Port> 
    <Protocol>TCP</Protocol> 
  </Syslog> 
</MessageLogging>

I would appreciate any advice on how to proceed from here. Thank you!