LB_FAILED. Why exactly?

So been a while but came across this and thought I would share. You can use the command event info within the LB_FAILED event to log a failure reason. You can find the table of failure events in the iRules wiki at iRules event

An example of a very simple iRule to capture this:

when LB_FAILED {

    log local0.alert "LB_FAILED triggered,  error code: [event info]"
    
}