code: func (p *peerConnection) SetNodeDataIdle(delivered int) {
  	p.setIdle(p.stateStarted, delivered, &p.stateThroughput, &p.stateIdle)
  }
docs: // SetNodeDataIdle sets the peer to idle, allowing it to execute new state trie
  // data retrieval requests. Its estimated state retrieval throughput is updated
  // with that measured just now.