emqx4.3/examples/force_shutdown.conf.example

##--------------------------------------------------------------------
## Force Shutdown
##
## Forced closing of the overloaded session
##--------------------------------------------------------------------
## Note: This is an example of how to configure this feature
##       you should copy and paste the below data into the emqx.conf for working

force_shutdown {
    ## false to disable this
    enable = true

    ## Maximum mailbox size for each Erlang process
    ## Note: Do not modify this unless you know what this is for
    max_mailbox_size = 1000

    ## Maximum heap size for each session process
    max_heap_size = 32MB
}