After a device goes online, it may happen that there are a lot of requests for new keys queued up. Responding to all of them would likely overflow the limit, which is 100, which could cause some sessions to be invalid. Similar to what we do on keyservers, we can debounce the response to such requests.

https://linear.app/comm/issue/ENG-10753/session-recovery-sometimes-fails

Depleted all the OTKs for a device while it was offline. Created a couple of sessions so that new refresh key requests were queued. Turn the internet on and verified that only some responses were sent. (concretely, requested 3 batches of keys, and after all the sessions were created, only 7 keys were left - so two batches of keys were sent to Identity).