Get the max slot seen from after shred insert.
POST Category: slot
curl "https://eu.fluxrpc.com?key=<your-API-key>" -s -X POST -H "Content-Type: application/json" -d '
{
"jsonrpc": "2.0",
"id": 1,
"method": "getMaxShredInsertSlot"
}'
{
"jsonrpc": "2.0",
"result": 1234,
"id": 1
}