The dashboard gives you an overview of the following stats for the network:
Shows the "heaviest" block in terms of cumulative difficulty. In other words, the latest block number of the longest valid chain.
Shows the time, in seconds, since the last block was mined. This value is a good indicator of whether the network is still up and running. A value noticeably above the average time between blocks indicates that the network is no longer mining blocks.
Average block time
Shows the average time, in seconds, it takes for the network to mine a new block.
Shows the number of nodes in this network.
Shows the number of transactions for the last 10 blocks.
Shows the amount of gas spent for the last 10 blocks.