“Panel plugin not found: graph” error in Plesk

Wondering how to resolve “Panel plugin not found: graph” error in plesk? We can help you.

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Let’s take a look at how our Support Team help a customer  deal with this Plesk error.

How to resolve “Panel plugin not found: graph” error in Plesk?

Graphs are not displayed in Advanced Monitoring, but the following error is shown:

Panel plugin not found: graph
The plesk-json-backend-datasource plugin is not installed

Also, the following warning can be found in /var/log/plesk/panel.log when accessing Advanced Monitoring with debug mode enabled:

WARN [extension/grafana] Dashboard update failed. ID: monitoring__network. Error: Invalid username or password
Usually, issue occurs due to corrupted Grafana installation.

Today, let us see the steps followed by our Support Techs to resolve it.

1. Firstly, connect to the server via SSH

2. Then, remove the Grafana extension:

plesk bin extension --uninstall grafana

3. Next, remove the Advanced Monitoring extension:

plesk bin extension --uninstall monitoring

4. Then, remove Grafana from the server:

For Debian or Ubuntu operating systems:

apt purge grafana && rm -rf /usr/share/grafana /etc/grafana /var/lib/grafana

For RHEL, CentOS or CloudLinux operating systems:

yum remove grafana && rm -rf /usr/share/grafana /etc/grafana /var/lib/grafana

5. Next, reinstall the Grafana extension:

plesk bin extension --install grafana
plesk bin extension --install monitoring

6. Finally, if the following error message is shown at Advanced Monitoring, press Fix installation button:

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Conclusion

Today, we saw steps followed by our Support Engineers to resolve “Panel plugin not found: graph” error.

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