Github user resmo commented on the pull request:

    https://github.com/apache/cloudstack/pull/829#issuecomment-142906721
  
    This is perfectly clear to me. The problem is we are relaying on the 
`update_time` (not to mix up with `power_state_update_time`).
    
    ~~~
    *************************** 1. row ***************************
               instance_name: r-2978-VM
                        type: DomainRouter
                 update_time: 2015-08-24 21:54:42
     power_state_update_time: 2015-09-09 08:30:42
    power_state_update_count: 3
    1 row in set (0.00 sec)
    ~~~
    
    here
    ~~~java
    // 2 times of sync-update interval for graceful period
                long milliSecondsGracefullPeriod = PingInterval.value() * 2000L;
    
                for (VMInstanceVO instance : vmsThatAreMissingReport) {
    
                    Date vmStateUpdateTime = instance.getUpdateTime();
    //...
                    long milliSecondsSinceLastStateUpdate = 
currentTime.getTime() - vmStateUpdateTime.getTime();
    
                    if (milliSecondsSinceLastStateUpdate > 
milliSecondsGracefullPeriod) {
    ~~~ 
    
    so this calculation would do this:
    ~~~
    milliSecondsSinceLastStateUpdate = currentTime.getTime() - 
vmStateUpdateTime.getTime() 
    2015-09-24 13:46:48 - 2015-08-24 21:54:42 ~= 1 month
    
    if (1 month > 2 minutes grace period)
    ~~~
    
    still the opinion, increasing grace period would help?


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