SystemRequires admin/root
WMI Trace Logs
Windows Management Instrumentation writes ETW trace logs under %WinDir%/System32/LogFiles/WMI for providers such as WMI-Activity and related diagnostics, capturing event records, buffer flushes, and trace session output used for troubleshooting management, driver, and system-service activity. These logs can accumulate after repeated errors, verbose tracing, or long-running diagnostic sessions; Kudu removes old WMI trace log files from this folder without touching the WMI repository, system settings, accounts, or application data.
Why clean WMI Trace Logs?
- A WMI provider stuck generating repeated errors can flood ETW trace files, and the visible symptom is the LogFiles\WMI folder growing unexpectedly into hundreds of megabytes or more
- Verbose tracing left enabled after troubleshooting keeps appending event records on every boot, so users notice steady disk growth even though no new software was installed
- Oversized WMI trace logs make Event Viewer and support log collection slower because Windows has to enumerate and package far more diagnostic data than necessary
- Corrupted or partially written trace files can cause trace parsing failures during troubleshooting, showing up as unreadable logs or errors when opening collected diagnostics
- When the system drive is already low on space, accumulated WMI traces contribute to Windows warning about limited storage and can block updates or crash dump creation
- Long-running trace sessions often preserve old diagnostics that no longer match the current driver or service state, so support investigations get noisy and users see misleading historical errors
- Cleaning old WMI trace output removes stale diagnostic files while leaving live management data intact, so WMI queries, hardware inventory, and administrative scripts continue working normally
What gets cleaned
Cache paths Kudu targets
Windows
%WinDir%/System32/LogFiles/WMI |
Frequently asked
Common questions about WMI Trace Logs
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