emqx4.3/examples/conn_congestion.conf.example

##--------------------------------------------------------------------
## Connection Congestion
##
## Generating alarm when MQTT connection congested
##--------------------------------------------------------------------
## 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

conn_congestion {
    ## Enable or disable connection congestion alarm
    enable_alarm = true

    ## Minimal time before clearing the alarm
    min_alarm_sustain_duration = 1m
}