fcs(Filesystem Client)
        acs(Aggregate)
        xcs-->acs
        ccs-->acs
        fcs-->acs
    end
```

#### ServiceDiscovery

The other primary interface is the ServiceDiscovery. Similar to ConfigStore, this aggregates over a variety of resources. However, it does not provide generic resource access, and instead precomputes a variety of service-oriented internal resources, such as `model.Service` and `model.ServiceInstance`.