The returned data is
Per-message arrays.
Index 0 is total number of $ThisType messages received since program start (or uint64 counter wrap).
Index 1 is total byte count since program start (or uint64 counter wrap).
They are returned as strings due to unfortunate JSON implementations in the field that do not handle unquoted uint64 numbers correctly.
Peer information. Returns number of inbound, outbound and total peers. Total peer count is equivalent to RPC 'getconnectioncount'.