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This knowledge base article provides steps to troubleshoot and resolve The "No recent performance data available. Is the system online?" messages for a Windows Agent element in the Global Scan tab. A similar article for WMI elements can be found in "No recent performance data available. Is the system online?" - WMI elements.
This message indicates that the Platform Performance Gatherer platform performance gatherer (PPG), a background service monitor responsible for gathering performance metrics , such as CPU, memory, and disk, is unable to properly collect metrics. The most common reason the PPG fails for Agent agent elements is corrupted or unavailable Windows performance counters.

To verify if and which metrics the counters are failing for, run Poll Agent tool for Windows element.and for which metrics

1. Browse to the Windows element in the Uptime Infrastructure Monitor web interface.
2. Click on Select the Info tab, and then click the Poll Agent link in from the list on the left side.

The metrics where the counters are failing will likely contain an ERR string. To resolve this issue, try rebuilding the performance counters using the steps outlined in the article Rebuilding Windows Performance Countersin Rebuilding Windows performance counters.

For related information, see No recent performance data available. Is the system online? message in WMI elements.