[metrics-team] bw history outage?

[Karsten Loesing]

On 2019-10-08 19:57, nusenu wrote:
> Hi,

Hi nusenu,

> what happened to the bw history line on this graph?
> https://metrics.torproject.org/bandwidth.html
> 
> https://metrics.torproject.org/bandwidth.html?start=2019-10-01&end=2019-10-08
> 
> The advertised bandwidth line continues but the
> bw history appears to have stopped at 2019-10-03

Bandwidth history is always a bit behind advertised bandwidth.

The reason is that bandwidth histories are contained in extra-info
descriptors. Relays typically publish new extra-info descriptors every
12 to 18 hours, and we need to wait for all bandwidth histories for a
given UTC day to come in.

Advertised bandwidths are contained in server descriptors, and we use
whichever server descriptor is referenced from a consensus to compute
advertised bandwidth. This means we only need to wait for the UTC day to
end before computing total advertised bandwidth.

> thanks,
> nusenu

All the best,
Karsten

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