Vernemq Webhook Auth Caching

[Kedar Undale]

Hello , 
As per vernemq documents , the auth_on_register, auth_on_publish, auth_on_subscribe hook data is saved to in memory of the verne node. These hook data are not actively disposed, does this mean

1. The hook data are never deleted (evicted) from the memory ?

2. The hook data is deleted after some time from expiry?

3. The memory consumption will keep on increasing when new clients are connected, publish and subscribe from any node of cluster. How can we handle this?

Please provide your input on the above questions
Thanks :)