[metrics-team] deleting tor metrics for long-running relays after 6 weeks of downtime

[Karsten Loesing]

On 2018-12-14 05:02, Erkko Roosimäe wrote:
> Hi,

Hi Erkko,

> just a thought. I ran tor relay at home for some years. Now it happened
> to ruin its sd card and were offline for 6 weeks until i finally
> remembered to order new one... And to my surprise, all those previous
> years of metrics data for my relay are just vanished.
> 
> Kinda leaves me an impression that you perhaps dont appreciate those
> relay-runners too much, if deleting years of data comes so easily to you.
> 
> Just my opinion. Maybe or maybe not your official attitude. But thats
> the impression this leaves.

Sounds like your newly setup relay generated a new identity key.

We identify relays using the identity key digest, and when a relay
generates a new identity key, we have no way to say whether the old
relay and the new relay are in fact the same.

Also, for performance reasons, we're only including relays in Relay
Search that have been running in the past week.

If you want to avoid this to happen again in the future, you may want to
look at the OfflineMasterKey option.

Hope this explains what happened and why. Thanks for running a relay!

All the best,
Karsten

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