Articles in this section

See more

Advanced Monitoring does not work: Panel plugin not found: graph

Avatar
Benjamin Weßel
Updated
Follow
kb: technical ABT: Group A Plesk Obsidian for Linux

Applicable to:

  • Plesk Obsidian for Linux

Symptoms

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

    CONFIG_TEXT: Panel plugin not found: graph

    CONFIG_TEXT: The plesk-json-backend-datasource plugin is not installed

  • The following messages can be found in /var/log/grafana/grafana.log:

    CONFIG_TEXT: lvl=eror msg="Request Completed" logger=context userId=0 orgId=0 uname= method=GET path=/login/generic_oauth status=500 remote_addr=127.0.0.1 time_ms=0 size=1766 referer="https://203.0.113.2:8443/modules/monitoring/index.php/index/main?context=extNavButton_monitoring_1"

    and

    CONFIG_TEXT: lvl=eror msg="Failed to save invalid login attempt" logger=login err="attempt to write a readonly database"
    lvl=eror msg="Invalid username or password" logger=context error="Invalid Username or Password"

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

    CONFIG_TEXT: WARN [extension/grafana] Dashboard update failed. ID: monitoring__network. Error: Invalid username or password

Cause

Corrupted Grafana installation.

Resolution

  1. Connect to the server via SSH

  2. Remove the Grafana extension:

    # plesk bin extension --uninstall grafana

  3. Remove the Advanced Monitoring extension:

    # plesk bin extension --uninstall monitoring

  4. 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. Reinstall the Grafana extension:

    # plesk bin extension --install grafana

    # plesk bin extension --install monitoring

  6. If the following error message is shown at Advanced Monitoring, press Fix installation button:
    inline778870369.png

Comments

1 comment

Sort by Date Votes
  • Avatar
    Linus Holtstiege (Edited )

    Article idea:

    Advanced Monitoring does not work: Could not find plugin definition for data source

    Fix for empty grafana panels inside Advanced Monitoring.

    Grafana Logs look like:

    logger=plugin.loader t=2022-10-13T18:34:22.032073521+02:00 level=warn msg="Skipping loading plugin due to problem with signature" pluginID=plesk-json-backend-datasource status=unsigned
    logger=context userId=1 orgId=1 uname=admin t=2022-10-13T18:38:47.239550914+02:00 level=error msg="Could not find plugin definition for data source" datasource_type=plesk-json-backend-datasource
    logger=context userId=1 orgId=1 uname=admin t=2022-10-13T18:38:47.327509741+02:00 level=error msg="Could not find plugin definition for data source" datasource_type=plesk-json-backend-datasource
    logger=context userId=1 orgId=1 uname=admin t=2022-10-13T18:38:47.327538896+02:00 level=error msg="Could not find plugin definition for data source" datasource_type=plesk-json-backend-datasource
    logger=context userId=1 orgId=1 uname=admin t=2022-10-13T18:38:47.334118317+02:00 level=error msg="Could not find plugin definition for data source" datasource_type=plesk-json-backend-datasource

     

    The problem is in the grafana config there is a unallowed space between two plugins for the allow_loading_unsigned_plugins variable.
    To fix this issue only the space have to be removed.

    /etc/grafana/grafana.ini

    Find:

    allow_loading_unsigned_plugins = grafana-simple-json-backend-datasource, plesk-json-backend-datasource

    Replace with:

    allow_loading_unsigned_plugins = grafana-simple-json-backend-datasource,plesk-json-backend-datasource

     

    Restart grafana service.

    systemctl restart grafana-server

    Advanced monitoring should now show all panels again.

    0
    Comment actions Permalink

Please sign in to leave a comment.

Have more questions? Submit a request

Related articles