func addStatusParts(qsc tabletserver.Controller) {
	servenv.AddStatusPart("Tablet", tabletTemplate, func() interface{} {
		return map[string]interface{}{
			"Tablet":               topo.NewTabletInfo(agent.Tablet(), -1),
			"BlacklistedTables":    agent.BlacklistedTables(),
			"DisallowQueryService": agent.DisallowQueryService(),
			"DisableUpdateStream":  !agent.EnableUpdateStream(),
		}
	})
	servenv.AddStatusFuncs(template.FuncMap{
		"github_com_youtube_vitess_health_html_name": healthHTMLName,
	})
	servenv.AddStatusPart("Health", healthTemplate, func() interface{} {
		return &healthStatus{
			Records: agent.History.Records(),
			Config:  tabletmanager.ConfigHTML(),
		}
	})
	qsc.AddStatusPart()
	servenv.AddStatusPart("Binlog Player", binlogTemplate, func() interface{} {
		return agent.BinlogPlayerMap.Status()
	})
	if onStatusRegistered != nil {
		onStatusRegistered()
	}
}

// Open try to build query rules from local file and push the rules to vttablet
func (fcr *FileCustomRule) Open(qsc tabletserver.Controller, rulePath string) error {
	fcr.path = rulePath
	if fcr.path == "" {
		// Don't go further if path is empty
		return nil
	}
	data, err := ioutil.ReadFile(fcr.path)
	if err != nil {
		log.Warningf("Error reading file %v: %v", fcr.path, err)
		// Don't update any internal cache, just return error
		return err
	}
	qrs := tabletserver.NewQueryRules()
	err = qrs.UnmarshalJSON(data)
	if err != nil {
		log.Warningf("Error unmarshaling query rules %v", err)
		return err
	}
	fcr.currentRuleSetTimestamp = time.Now().Unix()
	fcr.currentRuleSet = qrs.Copy()
	// Push query rules to vttablet
	qsc.SetQueryRules(FileCustomRuleSource, qrs.Copy())
	log.Infof("Custom rule loaded from file: %s", fcr.path)
	return nil
}

// refreshData gets query rules from Zookeeper and refresh internal QueryRules cache
// this function will also call TabletServer.SetQueryRules to propagate rule changes to query service
func (zkcr *ZkCustomRule) refreshData(qsc tabletserver.Controller, nodeRemoval bool) error {
	data, stat, err := zkcr.zconn.Get(zkcr.path)
	zkcr.mu.Lock()
	defer zkcr.mu.Unlock()
	if err == nil {
		qrs := tabletserver.NewQueryRules()
		if !nodeRemoval {
			err = qrs.UnmarshalJSON([]byte(data))
			if err != nil {
				log.Warningf("Error unmarshaling query rules %v, original data '%s'", err, data)
				return nil
			}
		}
		zkcr.currentRuleSetVersion = stat.Mzxid()
		if !reflect.DeepEqual(zkcr.currentRuleSet, qrs) {
			zkcr.currentRuleSet = qrs.Copy()
			qsc.SetQueryRules(ZkCustomRuleSource, qrs.Copy())
			log.Infof("Custom rule version %v fetched from Zookeeper and applied to vttablet", zkcr.currentRuleSetVersion)
		}
		return nil
	}
	log.Warningf("Error encountered when trying to get data and watch from Zk: %v", err)
	return err
}

// ActivateZkCustomRules activates zookeeper dynamic custom rule mechanism
func ActivateZkCustomRules(qsc tabletserver.Controller) {
	if *zkRulePath != "" {
		qsc.RegisterQueryRuleSource(ZkCustomRuleSource)
		zkCustomRule.Open(qsc, *zkRulePath)
	}
}

// ActivateFileCustomRules activates this static file based custom rule mechanism
func ActivateFileCustomRules(qsc tabletserver.Controller) {
	if *fileRulePath != "" {
		qsc.RegisterQueryRuleSource(FileCustomRuleSource)
		fileCustomRule.Open(qsc, *fileRulePath)
	}
}