resyncStatus map[string]SiteResyncStatus
	// map peer deployment ID to resync ID
	peerResyncMap map[string]resyncState
}

func newSiteResyncMetrics(ctx context.Context) *siteResyncMetrics {
	s := siteResyncMetrics{
		resyncStatus:  make(map[string]SiteResyncStatus),
		peerResyncMap: make(map[string]resyncState),
	}
	go s.save(ctx)
	go s.init(ctx)
	return &s
}

// init site resync metrics