func (m *CirconusMetrics) FlushMetrics() *Metrics {
	m.flushmu.Lock()
	if m.flushing {
		m.flushmu.Unlock()
		return &Metrics{}
	}

	m.flushing = true
	m.flushmu.Unlock()

	_, output := m.packageMetrics()

	m.flushmu.Lock()
	m.flushing = false
	m.flushmu.Unlock()

	return &output
}
func (m *CirconusMetrics) FlushMetrics() *Metrics {
	m.flushmu.Lock()
	if m.flushing {
		m.flushmu.Unlock()
		return &Metrics{}
	}

	m.flushing = true
	m.flushmu.Unlock()

	_, output := m.packageMetrics()

	m.flushmu.Lock()
	m.flushing = false
	m.flushmu.Unlock()

	return &output
}
// FlushMetrics flushes current metrics to a structure and returns it (does NOT send to Circonus)