Improve error message for membership resolver

common/membership/resolver.go

@@ -214,7 +214,7 @@ func (rpo *MultiringResolver) LookupByAddress(service, address string) (HostInfo
 		}
 	}
 	rpo.metrics.Scope(metrics.ResolverHostNotFoundScope).IncCounter(1)
-	return HostInfo{}, errors.New("host not found")
+    return HostInfo{}, fmt.Errorf("host not found in service %s: %s", service, address)
 }
 
 func (rpo *MultiringResolver) MemberCount(service string) (int, error) {