If we send in a low-level discovery JSON with 3000 elements, we get this error in the server log:

[Z3005] query failed: [-1] ORA-01795: maximum number of expressions in a list is 1000 [select key_ from items where hostid=10105 and key_ in ('echo[1]','echo[2]','echo[3]','echo[4]','echo[5]','echo[6]',...,'echo[2998]','echo[2999]','echo[3000]')