I feel like it could be named better as

osquery.jitter

suggests jitter for all osquery things. Maybe it would be better in the logger area as

logger_tls_period_jitter

in that case?

it's jitter on when fleet sends certain queries, such as labels and policies, to the hosts. Scheduled queries are a different matter, and that is something that goes through a separate mechanism

It's a bit confusing because you have splay which is jitter on when queries execute, and then something called

osquery.jitter

that only jitters whatever those certain things are.