[keycloak-user] will k_logout/back channel logout be initiated when the SSO Session Idle thresh hold is reached?

Hi, I am pretty novice to keycloak, and from some debugging sessions and going through the code,  i think  InMemorySessionIdMapper  is where keycloak stores the mapping between user, applications he has logged in and number of active idm sessions the application/client has. When the admin force logout the user from the admin console, logout or logoutAll happens. And when  keycloak recieves logout, it invokes the logout of application through back channel. Will the backchannel logouts be called, when the  SSO Session Idle  time treshhold is reached ? If not will this not cause InMemorySessionIdMapper  to grow huge over a period of time and cause potential memory leak? Regards, Madhu