func (ps *PushContext) OnConfigChange() {
	LastPushMutex.Lock()
	LastPushStatus = ps
	LastPushMutex.Unlock()
	ps.UpdateMetrics()
}

// UpdateMetrics will update the prometheus metrics based on the
// current status of the push.
func (ps *PushContext) UpdateMetrics() {
	ps.proxyStatusMutex.RLock()
	defer ps.proxyStatusMutex.RUnlock()

	for _, pm := range metrics {