CPU and Memory usage widgets fail to load on Plesk home screen: Request failed with status code 500

Dobrin Ivanov

Updated July 14, 2026 19:04

Plesk for Linux

Applicable to:

Plesk for Linux

Symptoms

Both CPU and Memory usage widgets display the following error on the Plesk home page:
The following error is logged in the Plesk panel log at /var/log/plesk/panel.log:

CONFIG_TEXT: [2024-12-13 23:36:38.197] 467571:675cb6f6300d0 ERR [extension/monitoring] /usr/local/psa/admin/plib/modules/monitoring/library/RrdLib/RrdHeader.php(92): Empty file.
[2024-12-13 23:36:38.239] 467574:675cb6f63a8b8 ERR [extension/monitoring] /usr/local/psa/admin/plib/modules/monitoring/library/RrdLib/RrdHeader.php(92): Empty file

The solutions from each of these articles do not resolve the issue:

▪ Plesk Monitoring thresholds cannot be updated: Request failed with status code 500 – Plesk
▪ Monitoring widget in Plesk panel shows error: Request failed with status code 500 – Plesk

Cause

The root cause of the issue is unknown.

More information on Jira PPS-17138

Resolution

In order to resolve the issue, fully remove the Monitoring and Grafana extensions and their relative data and then re-install them. That can be achieved by executing the following steps:

Connect to the server via SSH
Uninstall Grafana and Monitoring Extensions:

# plesk bin extension --uninstall grafana
# plesk bin extension --uninstall monitoring
Remove Grafana from the server completely by executing one of the following commands (based on the operating system):

▪ For Debian-based operating systems:

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

▪ For RHEL-based operating systems:

# yum remove grafana && rm -rf /usr/share/grafana /etc/grafana /var/lib/grafana
Delete the folder /usr/local/psa/var/health/data and its content:

# rm -rf /usr/local/psa/var/health/data
Reinstall Grafana and Monitoring Extensions:

# plesk bin extension --install grafana
# plesk bin extension --install monitoring
Restart sw-collectd to regenerate stat files:

# systemctl restart sw-collectd