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I am changing more alerts to not alert on "no data": https://gitlab.suse.de/okurz/salt-states-openqa/-/merge_requests/3 . This won't address the original problem. To me it seems like the network connection between OSD and the new location of monitor.qa.suse.de within SUSE Nbg SRV2 server room might suffer from unreliabilities

I did a mtr yesterday from OSD to openqa-monitor.qa.suse.de and saw a very tiny package drop of 0.3% there. I think this shouldn't cause the problem. However the telegraf logs on OSD show:

Feb 24 08:54:42 openqa telegraf[13914]: 2022-02-24T07:54:42Z E! [outputs.influxdb] when writing to [http://openqa-monitor.qa.suse.de:8086]: Post "http://openqa-monitor.qa.suse.de:8086/write?db=telegraf": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
Feb 24 08:54:42 openqa telegraf[13914]: 2022-02-24T07:54:42Z E! [agent] Error writing to outputs.influxdb: could not write any address

All I can find (and what the error message also explains) this is most likely due to some network problem: https://github.com/influxdata/telegraf/issues/10566#issuecomment-1027974951
But I cannot make sense what causes this. It was after the move but nothing really broke. The VM for monitor is not particular busy, package loss looks good and DNS resolution from OSD als looks good with 356 ms max. I used the following command to test this:

for i in {1..1000}; do dig monitor.qa.suse.de | grep -i "Query time"; done | cut -d ":" -f 2 | cut -d " " -f 2 | sort -h

Running on OSD while true; do dd bs=100M count=20 if=/dev/zero | nc -l 42420; done

and a test using multiple endpoints for i in backup.qa qanet.qa monitor.qa openqaworker13 qa-power8-5-kvm.qa root@seth-1.qa ; do ssh $i "echo \"### $i\" && timeout 3 nc openqa.suse.de 42420 | dd of=/dev/null" ;done reveals that qamaster (also running monitor.qa) seem to be slow, not all machines connected to the network switch qanet15nue:

### backup.qa
672+151 records in
777+1 records out
398200 bytes (398 kB, 389 KiB) copied, 3.00182 s, 133 kB/s
Welcome to qanet - DHCP/DNS server for vlan 12
### qanet.qa
608884+10604 records in
612084+1 records out
313387448 bytes (313 MB) copied, 3.00127 s, 104 MB/s
### monitor.qa
497+108 records in
574+1 records out
293944 bytes (294 kB, 287 KiB) copied, 3.00081 s, 98.0 kB/s
### openqaworker13
469280+11624 records in
474425+1 records out
242905720 bytes (243 MB, 232 MiB) copied, 3.00046 s, 81.0 MB/s
### qa-power8-5-kvm.qa
641934+45647 records in
648489+1 records out
332026752 bytes (332 MB, 317 MiB) copied, 3.00025 s, 111 MB/s
### root@seth-1.qa
432038+10003 records in
435561+1 records out
223007600 bytes (223 MB, 213 MiB) copied, 3.00018 s, 74.3 MB/s

Also qamaster itself is slow.

Nick Singer Yes we connected a new cable and a monitor now
Oliver Kurz you mean a new patch cable?
Nick Singer yes
Nick Singer now the throughput looks also perfectly fine
Nick Singer so either it was port 1 on the switch or the cable itself
Oliver Kurz Is it still on port 1?
Nick Singer no, 14
Oliver Kurz would you like to crosscheck? can you connect back to 1?
Nick Singer jup give me a sec
Nick Singer apparently I killed port 1
Oliver Kurz ping works on gi14 within a second after I see the link up on the switch, but not on gi1
Nick Singer now on port 14 with old cable
Oliver Kurz oh, ok. so not the cable, the port. I see. Can you connect something else to gi1? Maybe the "cable diagnostic mode" is still on for gi1?

my bandwidth check yields 110 MB/s (~0.88 GBit/s), as expected for 1 GBit/s connection minus overhead.

We tried different approaches to access the management interface. nsinger, okurz, mkittler, jbaier all failed with impitool, maybe that is misconfigured or disabled in the BMC. https://www.supermicro.com/support/faqs/faq.cfm?faq=28752 suggests to "Please try to do the factory default. 1) Log in to Web GUI. 2) Go to Maintenance >> BMC Restore Factory Defaults >> Click on Restore Factory Defaults". That is something we can try later. We have also tried "IPMIView" and the ipmitool from https://www.supermicro.com/en/solutions/management-software/ipmi-utilities but no joy.

Oliver Kurz show cable-diagnostics tdr interface gi1 says "no cable", for "gi2" it says "not tested". Can you connect a cable again please?
Oliver Kurz actually it should work with just a cable in gi1 with loose end

According to https://community.cisco.com/t5/switching/cable-diagnostics-tdr-not-completed/td-p/3035913 maybe the cable diagnostics could actually not be completed and now could be tried again after I called show cable-diagnostics tdr interface gi1.