Issue Monitoring: All graphs empty, error="request handler error: [plugin.notRegistered] plugin not registered" in log

[mow]

Server operating system version

Debian 11.6 x86_64

Plesk version and microupdate number

Plesk Obsidian 18.0.51.1

Hi,

in Monitoring I only see empty graphs:


I first noticed this after upgrading from debian 9 to 10 and then to 11.
There are no errors about grafana or monitoring logged in panel.log, only four
[2023-04-13 00:00:01.829] 1920545:643729e1ca6ea ERR [panel] Unable to get key: Repository is not opened
every day (but I can log into the panel and use everything).

/var/log/grafana/grafana.log complains about not registered plugins, e.g.:
logger=alerting.evalContext t=2023-04-13T15:34:03.004744718+02:00 level=error msg="Alert Rule Result Error" ruleId=4 name="MySQL memory usage" error="request handler error: [plugin.notRegistered] plugin not registered" changingstateto=keep_state
logger=alerting.evalContext t=2023-04-13T15:34:03.005355123+02:00 level=error msg="Alert Rule Result Error" ruleId=5 name="Plesk memory usage" error="request handler error: [plugin.notRegistered] plugin not registered" changingstateto=keep_state

What do?

 

[Peter Debik]

I cannot find anything on the specific error message, but other documentation suggests that either the repository from where Grafana is installed, is outdated or was a custom repository when it was first installed. One approach could be to remove Grafana and reinstall it, e.g. first check that the repository is pointing to the right source and not a customized one:

# cat /etc/apt/sources.list.d/plesk-ext-grafana.list
deb https://autoinstall.plesk.com/grafana/deb stable main

then remove grafana and monitoring

# plesk bin extension -u grafana
# plesk bin extension -u monitoring
# apt purge grafana && rm -rf /usr/share/grafana /etc/grafana /var/lib/grafana

then reinstall monitoring

# plesk bin extension -i monitoring

then navigate to extensions in GUI, open Monitoring and select "Use built-in monitoring".

Not tested, but as I know you're quite knowledgeable I am sure you know what this does. If you have doubts, this case would be worth an official support ticket, too.

 

[mow]

I cannot find anything on the specific error message, but other documentation suggests that either the repository from where Grafana is installed, is outdated or was a custom repository when it was first installed. One approach could be to remove Grafana and reinstall it, e.g. first check that the repository is pointing to the right source and not a customized one:

# cat /etc/apt/sources.list.d/plesk-ext-grafana.list
deb https://autoinstall.plesk.com/grafana/deb stable main

This has been moved to plesk's new location (as above) during or after the dist upgrade, and then recently got the pinned key mentioned in another thread:

deb [signed-by=/etc/apt/keyrings/plesk-ext-grafana.gpg] https://autoinstall.plesk.com/grafana/deb stable main

The versions look fine, too:
monitoring/meta.xml: <version>2.5.9</version>
grafana/meta.xml: <version>1.4.3</version>

Generally updates should be current, though I don't know why GUI shows this:

and shell this:

 # apt-get upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  libpng12-0
Use 'apt autoremove' to remove it.
The following packages have been kept back:
  linux-image-amd64
The following packages will be upgraded:
  ghostscript libgs9 libgs9-common
3 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 3,076 kB of archives.
After this operation, 0 B of additional disk space will be used.

(is now upgraded)


Removed, reinstalled, and

then navigate to extensions in GUI, open Monitoring and select "Use built-in monitoring".

Works now.

And now I see what has been the problem:
ii grafana 8.5.21 amd64 Grafana

Before the purge it was:
ii grafana 9.2.3 amd64 Grafana

So it somehow managed to grab a newer incompatible version, probably directly from grafana when it was still sourced from there before they restructured their server and plesk went to host it in their own repository.