trigger LogErrorEventTrigger on LogErrorEvent__e (after insert) {
    Log__c[] logs = new Log__c[0];
    for(LogErrorEvent__e record: Trigger.new) {
        logs.add(new Log__c(Log__c=record.Log__c));
    }
    insert logs;
}

trigger CustomObjectTrigger on CustomObject__c (after insert) {
    LogErrorEvent__e[] logs = new LogErrorEvent__e[0];
    for(CustomObject__c record: Trigger.new) {
        logs.add(new LogErrorEvent__e(Log__c='Blocked insert'));
        record.addError('Block insert');
    }
    EventBus.publish(logs);
}