What are the Transport Metrics Shown for a Conference on the Dashboard?

The dashboard lists transport and delay metrics on both the Peer Connection level and the Media Stream Track level.

Transport Metrics:

• Media Throughput
• Packet Rate
• Network Throughput 
• Network Packets
• Network Packets Discarded on Send
• Network Bytes

Delay Metrics:

• Network Latency 
• Latency
• Jitter

For more details see the Identifiers for WebRTC's Statistics API.