code: func (p *Peer) LastPingMicros() int64 {
  	p.statsMtx.RLock()
  	lastPingMicros := p.lastPingMicros
  	p.statsMtx.RUnlock()
  
  	return lastPingMicros
  }
docs: // LastPingMicros returns the last ping micros of the remote peer.
  //
  // This function is safe for concurrent access.