The error message you provided, "A server does not collect data for CloudLinux plus: There is an error with signal SIGKILL. Error: [Errno 22] Invalid argument," indicates that there's an issue with the collection of data for CloudLinux Plus, possibly related to a signal or system call.

To troubleshoot this issue, you can try the following steps:

1. Check System Logs:

   • Look in system logs (such as /var/log/messages, /var/log/syslog, or CloudLinux-specific logs) for any additional error messages or information related to this issue.

2. Verify Signal Handling:

   • SIGKILL (signal 9) is a signal that cannot be caught, blocked, or ignored. If a process is receiving SIGKILL, it means the system is forcefully terminating it. Check if there are any processes in an abnormal state that might be causing this.

3. Check Resource Limits:

   • Ensure that the resource limits for the CloudLinux Plus collection process are set appropriately. It might be hitting some sort of limit, causing the error.

4. Check for Permissions:

   • Ensure that the process trying to collect data has the necessary permissions to access and write to the required directories or files.

5. Update CloudLinux and Related Software:

   • Make sure you're using the latest version of CloudLinux and any related software. There might be bug fixes or improvements in newer versions.

6. Check for Disk Space:

   • Verify that there is enough free disk space on the server. A lack of disk space could lead to various errors.

7. Check for Filesystem Corruption:

   • Run filesystem checks (e.g., fsck) to ensure that the filesystem is healthy and not corrupted.

8. Contact CloudLinux Support:

   • If you're using a CloudLinux Plus subscription, consider reaching out to CloudLinux support. They may have encountered and solved this issue before and can provide specific guidance.

9. Verify Configuration Files:

   • Check any configuration files related to CloudLinux Plus to ensure they are correctly configured and that there are no syntax errors.

10. Check for Custom Scripts or Cron Jobs:

    • If you have any custom scripts or cron jobs related to CloudLinux, ensure they are functioning as expected and not causing conflicts.

11. Reinstall or Reconfigure:

    • If all else fails, consider reinstalling or reconfiguring the CloudLinux Plus component. This might resolve any misconfigurations or corrupted files.

Remember to always back up important data and configurations before making significant changes to your system. If you're not comfortable making these changes yourself, consider seeking the assistance of a system administrator or CloudLinux support.