How to fix wrong level classification in App Service Logs

Question

I set up logging in our Python App Service and when looking at the console logs, Azure is misclassifying the level of the logs. For example, a simple info log shows as an error when querying the logs. Here is a screenshot:

Answer 1

Hi Matt Schwartz

Welcome to the Microsoft Q&A Platform!
The issue you're facing seems to be related to the misclassification of log levels in Azure App Service Console Logs.

Ensure your logging levels are set correctly in the Python app.

import logging  
logging.basicConfig(level=logging.INFO)  
logger = logging.getLogger(__name__)  
logger.info("This is an INFO log.")  
logger.error("This is an ERROR log.")  

Go to Azure Portal > App Service > Diagnostic Settings.

Ensure logs for Application Logs and Console Logs are enabled and categories are correctly configured.
If using middleware Pass the correct log level when starting the application.
uvicorn app.main:app --log-level info
Implement a handler to explicitly map log levels.

 class AzureLogHandler(logging.Handler):  
    def emit(self, record):  
        level = record.levelname  
        if level == "INFO":  
            print(f"INFO:{record.getMessage()}")  
        elif level == "ERROR":  
            print(f"ERROR:{record.getMessage()}")  
handler = AzureLogHandler()  
logger.addHandler(handler)  

Use Log Analytics Workspace to query log levels with KQL.

AppServiceConsoleLogs  
| where Level == "Error"  
| project TimeGenerated, ResultDescription, Level  

Use Application Insights or third-party tools (e.g., ELK Stack) to validate the log levels independently.
ref: Python Logging Documentation
https://learn.microsoft.com/en-us/azure/azure-monitor/essentials/diagnostic-settings
https://learn.microsoft.com/en-us/kusto/query/kql-quick-reference?view=azure-data-explorer&preserve-view=true
https://learn.microsoft.com/en-us/azure/azure-monitor/app/app-insights-overview
https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request
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