Add indicator validator is caught-up to the network

[cfl0ws]

Ref #359

A key indicator if a validator is running as expected is if it's caught-up to the network. A common question in the validator Discord chat is how they can tell if their validator is caught-up to the network. An explorer indicator could be a "Yes/No" display and/or a current slot display.

From the TdS FAQ -

Monitor your validator to confirm it catches up to the latest network slot

(Note: This is also referred to as your validator “catching-up to the tip of the network”.)

After your validator is connected, it may take some time to catch up with the network. Use the get-slot wallet command to view the current slot that the network is processing:

$ solana get-slot

The current slot that your validator is processing can then been seen with:

$ solana --url http://127.0.0.1:8899 get-slot

To see both values at once, run:

$ echo "me: $(solana --url http://127.0.0.1:8899 get-slot | grep '^[0-9]+$'), cluster: $(solana --url http://tds.solana.com:8899 get-slot | grep '^[0-9]+$')"

Your validator is caught-up when your validator’s current slot matches the current slot the network is processing.

Until your validator has caught up, it will not be able to vote successfully and stake cannot be delegated to it.

Also if you find the network's slot advancing faster than yours, you will likely never catch up. This typically implies some kind of networking issue between your validator and the rest of the network.
We are working to publish a troubleshooting checklist. Until that time, please contact a Solana team member in the #tourdesol-stage0 Discord channel for troubleshooting assistance.