[atlas]Probe actually down?

Replying to various mails in the thread:


On 2010.12.30. 20:00, Richard L. Barnes wrote:
> Probe #394 is reported as being down in the web GUI, but I can ping6 to it without a problem.  I'm not near the probe right now, so I can't look at it or its traffic.  Are there known cases where probes are alive but not reporting to their controllers?
> 
> --Richard

There are a few scenarios when this is possible:
* the probe is powered on, but it's not connected to the infrastructure (for
example the connection went down for some reason, or after a reboot). In
this case you can still ping it as the network stack is running, but it's
reported as "down".
* Every now and then we have issues with the controllers' network
connections. They do reconnect themselves reliably, but if a probe connects
to such a controller in the meantime, then the controller cannot report the
probe status change to our database. A fix is in the making for this.


On 2011.01.04. 10:38, Egor Zimin wrote:
> I see the same situation with probe #163. 

This probe seems to be up now. There are days when it fluctuates, but also
periods when it's up for days.


On 2011.01.04. 10:46, Piotr Strzyzewski wrote:
> Maybe this is the right time to implement optional mail notifications
> about such events?

So you'd like to subscribe to notifications when your probe comes up or goes
down? It's certainly possible to do this, but -- since probe reconnects are
not really that serious events -- I think I'd rather want be notified if a
probe was down for a non-trivial time.

Cheers,
Robert