Zabbix 6.0.5. - vfs.fs.size // Mount is unavailable

[um3n]

Hello guys,

we have a windows system with a zabbix agent installed. Currently the C: Mount does not have any data. The error "mount C: is unavailable" is shown.
The other mounts are working as intended.

[root@ab-zbx-01 ~]# zabbix_get -s 192.168.200.70 -p 10050 -k vfs.fs.size[E:,used]
96566136832
[root@ab-zbx-01 ~]# zabbix_get -s 192.168.200.70 -p 10050 -k vfs.fs.size[D:,used]
182693838848
[root@ab-zbx-01 ~]# zabbix_get -s 192.168.200.70 -p 10050 -k vfs.fs.size[C:,used]
ZBX_NOTSUPPORTED: mount 'C:' is unavailable

Some ideas?

Kind regards,

Ulli

[um3n]

Recently I had the chance to get hands on the logs of the Windowsserver.

The Zabbix Agent 2 has a bunch of log entries like this:

2022/03/15 16:16:01.012011 Detected performance counter with negative denominator the second time after retry, giving up...
2022/03/15 16:16:02.012086 Detected performance counter with negative denominator the second time after retry, giving up...
2022/03/15 16:35:53.022987 Detected performance counter with negative denominator the second time after retry, giving up...
2022/03/15 16:35:54.024129 Detected performance counter with negative denominator the second time after retry, giving up...
2022/03/15 16:35:55.025238 Detected performance counter with negative denominator the second time after retry, giving up...
2022/03/15 17:03:29.032622 Detected performance counter with negative denominator the second time after retry, giving up...
2022/03/15 17:03:30.032897 Detected performance counter with negative denominator the second time after retry, giving up...
2022/03/15 17:03:31.032962 Detected performance counter with negative denominator the second time after retry, giving up...

After rebooting the agent we recieve new values for the C: mount.

Any Ideas why this is happening?

Kind regards!