David,
I've been following your progress in the "Add load balancing to bridge 
(#40095)" issue.
> The apparent decrease has to be spurious, since even at the beginning the 
>bridge was moving more than 10 MB/s in both directions. A couple of hypotheses 
>about what might be happening:   
   - Onionoo is only showing us one instance out of the four. The actual 
numbers are four times higher.
Per my previous response, my findings are consistent with yours in that Onionoo 
only shows metrics for a single instance; except, for consensus weight.
> Here are the most recent heartbeat logs. It looks like the load is fairly 
>balanced, with each of the four tor instances having sent between 400 and 500 
>GB since being started.

Your Heartbeat logs continue to appear to be in good health. When keys are 
rotated, the Heartbeat logs will be a key indicator in validating health 
whether connections are bleeding off from or remaining with a particular 
instance.
> I worried a bit about the "0 with IPv6" in a previous comment. Looking at the 
>bridge-stats files, I don't think there's a problem.
I'm glad to hear you feel the IPv6 reporting appears to be a false-negative. 
Does this mean there's something wrong with IPv6 Heartbeat reporting?
> Despite the load balancing, the 8 CPUs are pretty close to maxed. I would not 
>mind having 16 cores right now. We may be in an induced demand situation where 
>we make the bridge faster → the bridge gets more users → bridge gets slower.
I believe your observation is correct with regard to an induced traffic 
situation. As cpu resources increase, it will likely be lagged by increased 
traffic, until demand is satisfied or you run out of cpu resources, again. Are 
your existing 8 cpu's only single cores? Is it too difficult to upgrade with 
your VPS provider? The O/S should detect the virtual hardware changes and add 
them accordingly. My current resource constraint is RAM, but I'm using 
bare-metal machines.
Great Progress!

Gary—
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