Use presto-admin server status on each node to generate a status report.
Query repeatedly each of your 763 nodes for that staus.
Sort the result on the node URL and throw away all but the latest status. Turn that into HTML with a script.
Generate an HTML page to display which might look something like this ![enter image description here]( by perpetually refreshing an HTML page which draws on the status found from the server status reports: Green for Up, Yellow for No Report for X minutes, and Red for Down.
Also suggest you read up here on some of the availability monitoring tools available to monitor hundreds of nodes