[tor-relays] Node 6E02FDEA15122A492A799A58C4C11D02637B145A is marked as down, but logs display no issues

[0N ODV]

Hi all,
our node sacco.osservatorionessuno.org[1] has been marked down for more 
than a couple of days. It is at the latest version from Tor's Debian 
repository and I tried to restart both the service and the server. The 
process is running, and the 9001 and 9030 ports are open and succesfully 
reachable from the outside. The notice log I temporarily enabled to look 
for the issue apparently does not show any warning signs.

Here is an anonymized output of the log:

[notice] Tor 0.4.8.10 opening new log file.
[notice] We compiled with OpenSSL XXX and we are running with OpenSSL 
XXX. These two versions should be binary compatible.
[notice] Tor 0.4.8.10 running on Linux with Libevent XXX, OpenSSL XXX, 
Zlib XXX, Liblzma XXX, Libzstd XXX and Glibc XXX as libc.
[notice] Tor can't help you if you use it wrong! Learn how to be safe at 
https://support.torproject.org/faq/staying-anonymous/
[notice] Read configuration file "/etc/tor/torrc".
[notice] Based on detected system memory, MaxMemInQueues is set to 720 
MB. You can override this by setting MaxMemInQueues by hand.
[notice] Opening Socks listener on 127.0.0.1:9050
[notice] Opened Socks listener connection (ready) on 127.0.0.1:9050
[notice] Opening OR listener on XXX:9001
[notice] Opened OR listener connection (ready) on XXX:9001
[notice] Opening OR listener on [XXX]:9001
[notice] Opened OR listener connection (ready) on [XXX]:9001
[notice] Opening Directory listener on XXX:9030
[notice] Opened Directory listener connection (ready) on XXX:9030
[notice] Opening Directory listener on [XXX]:9030
[notice] Opened Directory listener connection (ready) on [XXX]:9030
[notice] Parsing GEOIP IPv4 file /usr/share/tor/geoip.
[notice] Parsing GEOIP IPv6 file /usr/share/tor/geoip6.
[notice] Configured to measure statistics. Look for the *-stats files 
that will first be written to the data directory in 24 hours from now.
[notice] Your Tor server's identity key fingerprint is 'sacco XXX'
[notice] Your Tor server's identity key ed25519 fingerprint is 'sacco XXX'
[notice] Bootstrapped 0% (starting): Starting
[notice] Starting with guard context "default"
[notice] Bootstrapped 5% (conn): Connecting to a relay
[notice] Unable to find IPv4 address for ORPort 9001. You might want to 
specify IPv6Only to it or set an explicit address or set Address.
[notice] Bootstrapped 10% (conn_done): Connected to a relay
[notice] Bootstrapped 14% (handshake): Handshaking with a relay
[notice] Bootstrapped 15% (handshake_done): Handshake with a relay done
[notice] Bootstrapped 75% (enough_dirinfo): Loaded enough directory info 
to build circuits
[notice] Bootstrapped 90% (ap_handshake_done): Handshake finished with a 
relay to build circuits
[notice] Bootstrapped 95% (circuit_create): Establishing a Tor circuit
[notice] External address seen and suggested by a directory authority: XXX
[notice] Bootstrapped 100% (done): Done
[notice] Now checking whether IPv4 ORPort XXX:9001 is reachable... (this 
may take up to 20 minutes -- look for log messages indicating success)
[notice] Now checking whether IPv6 ORPort [XXX]:9001 is reachable... 
(this may take up to 20 minutes -- look for log messages indicating success)
[notice] Self-testing indicates your ORPort XXX:9001 is reachable from 
the outside. Excellent.
[notice] Performing bandwidth self-test...done.
[notice] Self-testing indicates your ORPort [XXX]:9001 is reachable from 
the outside. Excellent. Publishing server descriptor.
[notice] Heartbeat: It seems like we are not in the cached consensus.
[notice] Heartbeat: Tor's uptime is XX hours, with XX circuits open. 
I've sent XX and received XX. I've received XXX connections on IPv4 and 
XXX on IPv6. I've made XXX connections with IPv4 and XXX with IPv6.
[notice] While bootstrapping, fetched this many bytes: XXX 
(microdescriptor fetch)
[notice] While not bootstrapping, fetched this many bytes: XXX (server 
descriptor fetch); XXX (server descriptor upload); XXX (consensus 
network-status fetch); XXX (microdescriptor fetch)
[notice] Circuit handshake stats since last time: X/X TAP, X/X NTor.
[notice] Since startup we initiated XXX and received XXX v1 connections; 
initiated 0 and received 0 v2 connections; initiated XXX and received 
XXX v3 connections; initiated XXX and received XXX v4 connections; 
initiated XXX and received XXX v5 connections.
[notice] Heartbeat: DoS mitigation since startup: 0 circuits killed with 
too many cells, 0 circuits rejected, 0 marked addresses, 0 marked 
addresses for max queue, 0 same address concurrent connections rejected, 
0 connections rejected, 0 single hop clients refused, 0 INTRODUCE2 rejected.
[notice] Your network connection speed appears to have changed. 
Resetting timeout to XXXms after XXX timeouts and XXX buildtimes.

We would appreciate any hint on how to proceed to debug the issue in 
order to keep the server useful.

Thank you
Giuio

[1] - 
https://metrics.torproject.org/rs.html#details/6E02FDEA15122A492A799A58C4C11D02637B145A