public ServerGroupList buildPhysicalServer(final Set<AgentAndStatus> agentSet) {
        final ServerGroupList.Builder builder = ServerGroupList.newBuilder();
        for (AgentAndStatus agentAndStatus : agentSet) {
            final ServerInstance serverInstance = new ServerInstance(agentAndStatus.getAgentInfo(), agentAndStatus.getStatus());
            builder.addServerInstance(serverInstance);
        }
        return builder.build();
    }
filled with application information of physical server and service instance

@param hostHistogram
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/nodes/ServerBuilder.java