The documentation says:
What happens when the maximum number of stored requests is reached (by default 25)?
Internally we store the requests in a FIFO Queue. This means that when the maximum number spaces in the queue are filled, we take the first one that was entered and remove it from the queue, thus making room for the new request.
How to increase this limit of 25? I want to use Glimpse to gather data and then dig it to diagnose after 30 users in 30 minutes session so there will be a lot more requests than 25.
Due to a boneheaded mistake, by me, the number of requests that Glimpse stores, which is supposed to be configurable, isn't.
The offending line can be seen in our implementation of ApplicationPersistanceStore.
Your best bet to get this running quickly is to build Glimpse yourself (very easy to do) and change BufferSize to whatever you see fit.
Alternately, you could implement your own IPersistanceStore and have it do whatever you'd like.