Is there a resource that details how alerts work? We're getting a lot of complaints about alerts not working, or rather, people not getting alerts when they expect to. What should I check to test this out? Which things affect the frequency of alerts? How do alerts actually work? When does it check and send out new alerts? Sometimes you seem to get a new one for every post in a thread, other times just the earliest one appears with "there may be more posts after this".