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Suppress unnecessary error log for ERROR_NOT_SUPPORTED cases #215

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Suppress unnecessary error log for ERROR_NOT_SUPPORTED cases #215

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3ef1ae3
fix JSON parser to correctly handle numeric values
bobsira Jul 22, 2025
40bf213
moving the parser change to a different PR
bobsira Aug 7, 2025
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42 changes: 28 additions & 14 deletions LogMonitor/src/LogMonitor/LogFileMonitor.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -701,13 +701,21 @@ LogFileMonitor::InitializeDirectoryChangeEventsQueue()
nullptr);
if (logFile == INVALID_HANDLE_VALUE)
{
logWriter.TraceError(
Utility::FormatString(
L"Error in log file monitor. Failed to open file %ws. Error = %d",
fileName.c_str(),
GetLastError()
).c_str()
);
//
// Added a conditional check to suppress logging for ERROR_NOT_SUPPORTED (benign error).
// This prevents unnecessary log pollution while still logging other actionable errors.
// https://github.com/microsoft/windows-container-tools/issues/125#issuecomment-3056545183
//
if (GetLastError() != ERROR_NOT_SUPPORTED)
{
logWriter.TraceError(
Utility::FormatString(
L"Error in log file monitor. Failed to open file %ws. Error = %d",
fileName.c_str(),
GetLastError()
).c_str()
);
}
Comment on lines +709 to +718
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@mloskot mloskot Jul 23, 2025 •
edited
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@bobsira I think similar workaround is needed here

windows-container-tools/LogMonitor/src/LogMonitor/LogFileMonitor.cpp

Lines 1082 to 1088 in 09983f6

logWriter.TraceError(
Utility::FormatString(
L"Error in log file monitor. Failed to query file ID. File: %ws. Error: %d",
fullLongPath.c_str(),
status
).c_str()
);

I'm testing your LogMonitor.exe build you linked in #214 (comment) and

image

The waitInSeconds: 10 does not seem to help delay the files query in this particular case.

My LogMonitorConfig.json is this

{
  "LogConfig": {
    "sources": [
      {
        "includeSubdirectories": false,
        "filter": "*.log",
        "directory": "C:\\Logs",
        "waitInSeconds": 10,
        "type": "File",
        "includeFileNames": true
      }
    ]
  }
}

The fix for ordering of the waitInSeconds seem to work.

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@mloskot please confirm if the issue still exists in this binary -> https://minikubevhdimagebuider.blob.core.windows.net/versions/LogMonitor.exe

It has the change you've suggested. if it's there we can move this fix to a different PR and let this handle the parser fix

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@bobsira Hmm, I've just tested LogMonitor.exe from that URL

Invoke-WebRequest -Uri 'https://minikubevhdimagebuider.blob.core.windows.net/versions/LogMonitor.exe' -OutFile C:/LogMonitor.exe -UseBasicParsing

and this version is reported inside the container - am I using the right custom ad-hoc build of yours?

image

but I can't see any difference

image

Here is my config inside the container

image

and logs location

image

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Hmmm, strange that should be the binary with the change. I'll go ahead and split the PR for now. I have a feeling this issue might be coming from another place in the code as well so let's have it addressed in a different PR.

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@mloskot mloskot Aug 5, 2025 •
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Good idea. Let's take baby steps. The overall direction seems fine though 😊


//
// Ignore failure and continue. In the worst case we will
Expand Down Expand Up @@ -1079,13 +1087,19 @@ LogFileMonitor::LogFileAddEventHandler(
if (status != ERROR_SUCCESS)
{
status = GetLastError();
logWriter.TraceError(
Utility::FormatString(
L"Error in log file monitor. Failed to query file ID. File: %ws. Error: %d",
fullLongPath.c_str(),
status
).c_str()
);
// Added a conditional check to suppress logging for ERROR_NOT_SUPPORTED (benign error).
// This prevents unnecessary log pollution while still logging other actionable errors.
// https://github.com/microsoft/windows-container-tools/issues/125#issuecomment-3056545183
if (status != ERROR_NOT_SUPPORTED)
{
logWriter.TraceError(
Utility::FormatString(
L"Error in log file monitor. Failed to query file ID for File: %ws. Error: %d",
fullLongPath.c_str(),
status
).c_str()
);
}
}

status = ReadLogFile(logFileInfo);
Expand Down
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