[tor-relays] metrics

[David Goulet]

On 20 Feb (11:52:33), Manager wrote:
>    Hello,
> 
>    im trying to enable prometheus metrics, and... something goes wrong:
> 
>    torrc:
>    MetricsPort 9166
>    MetricsPortPolicy accept *
> 
>    after tor restart in logs:
>    Tor[15368]: Opening Metrics listener on 127.0.0.1:9166
>    Tor[15368]: Could not bind to 127.0.0.1:9166: Address already in use. Is
>    Tor already running?
> 
>    -- before restart, no one listen on this port, as `ss | grep :9166` can
>    say.
> 
>    there is also backtrace in logs:
>    Tor[15368]: connection_finished_flushing(): Bug: got unexpected conn type
>    20. (on Tor 0.4.5.6 )
>    Tor[15368]: tor_bug_occurred_(): Bug:
>    ../src/core/mainloop/connection.c:5192: connection_finished_flushing: This
>    line should not have been reached. (Future instances of this warning will
>    be silenced.) (on Tor 0.4.5.6 )

This was reported 3 days ago:

https://gitlab.torproject.org/tpo/core/tor/-/issues/40295

And we pushed a fix upstream and will be in the next tor stable release thus
0.4.5.7. As for the timeline of that release, unclear but I will make a point
to the network team to make it sooner than usually because this problem is
effectively making the MetricsPort unusable :S.

Sorry about this. Thanks for the report!!!

David
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