When centralized monitoring is not displaying statistics, it can be due to various reasons. Here are steps you can take to troubleshoot and potentially resolve the issue:

1. Check Data Sources: Ensure that the data sources for your centralized monitoring system are properly configured and accessible. This includes servers, databases, applications, or any other resources that are being monitored.

2. Verify Network Connectivity: Confirm that there are no network issues between the monitoring system and the servers or devices being monitored. Check for any firewalls, routers, or network configurations that may be blocking the communication.

3. Check Monitoring Agent Status: If you're using monitoring agents on the servers, verify that they are running and properly configured. Check the agent logs for any error messages or warnings.

4. Examine Centralized Monitoring Software Logs: Review the logs of your centralized monitoring software for any error messages or warnings. This can provide valuable insights into what might be causing the issue.

5. Monitor Data Source Health: Ensure that the data sources themselves are healthy and provide the expected statistics. Check for any issues with the servers, services, or applications being monitored.

6. Permissions and Credentials: Confirm that the centralized monitoring system has the necessary permissions and credentials to access and retrieve data from the monitored resources. This includes database credentials, API keys, or other authentication methods.

7. Verify Data Collection Intervals: Check the monitoring system's configuration to ensure that data collection intervals are set appropriately. If intervals are too long, it may appear as if statistics are not being updated.

8. Test Individual Data Sources: Test the data sources individually to verify that they are able to provide statistics. This can help isolate whether the issue is with a specific data source or the centralized monitoring system itself.

9. Update and Restart Services: Ensure that your centralized monitoring software and any associated services are up to date. Consider restarting the monitoring services to see if it resolves the issue.

10. Check for Software Updates or Patches: Review the documentation and resources for your specific centralized monitoring software. There may be known issues or updates available that address this type of problem.

11. Contact Support: If the issue persists and you're unable to identify the root cause, consider reaching out to the support channels provided by the centralized monitoring software vendor or community.

Remember to document any changes you make during the troubleshooting process, and proceed with caution to avoid any accidental data loss or system damage.