What is the purpose of the WEBSITE_ENABLE_DIAGNOSTICS application setting? What are the effects of turning it ON or OFF?

Hi Kumar, Arun , Welcome to the Microsoft Q&A Platform! The purpose of the WEBSITE_ENABLE_DIAGNOSTICS setting in Azure App Services is to control the enabling of diagnostic features for your web application. It facilitates the collection of diagnostic data, such as HTTP logs, application logs, and telemetry, making it useful for debugging, monitoring, and performance analysis. Effects of Turning it ON: Application logs, web server logs, and detailed error messages are collected. Additional CPU, memory, and storage are used for logging and telemetry. Facilitates troubleshooting and issue identification. Data storage and processing may incur additional costs. It mainly enable During development, testing, or when troubleshooting issues in production. Effects of Turning it OFF Logging and monitoring features are turned off. Optimizes app performance by lowering resource consumption. Eliminates storage and processing costs related to diagnostics. May hinder proactive issue detection and troubleshooting. Disable it In production environments for optimized performance unless diagnostics are necessary. Use external tools like Application Insights for lightweight monitoring. ref: https://learn.microsoft.com/en-us/azure/app-service/troubleshoot-diagnostic-logs If the answer is helpful, please click Accept Answer and kindly upvote it

Understanding the WEBSITE_ENABLE_DIAGNOSTICS Application Setting

Accepted answer

Shree Hima Bindu Maganti 2,185 Reputation points Microsoft Vendor

2025-01-10T12:23:29.9+00:00
Hi Kumar, Arun ,
Welcome to the Microsoft Q&A Platform!
The purpose of the WEBSITE_ENABLE_DIAGNOSTICS setting in Azure App Services is to control the enabling of diagnostic features for your web application. It facilitates the collection of diagnostic data, such as HTTP logs, application logs, and telemetry, making it useful for debugging, monitoring, and performance analysis.
Effects of Turning it ON:

Application logs, web server logs, and detailed error messages are collected.

Additional CPU, memory, and storage are used for logging and telemetry.

Facilitates troubleshooting and issue identification.

Data storage and processing may incur additional costs. It mainly enable During development, testing, or when troubleshooting issues in production.

Effects of Turning it OFF

Logging and monitoring features are turned off.

Optimizes app performance by lowering resource consumption.

Eliminates storage and processing costs related to diagnostics.

May hinder proactive issue detection and troubleshooting. Disable it In production environments for optimized performance unless diagnostics are necessary. Use external tools like Application Insights for lightweight monitoring.
ref:https://learn.microsoft.com/en-us/azure/app-service/troubleshoot-diagnostic-logs
If the answer is helpful, please click Accept Answer and kindly upvote it
Please sign in to rate this answer.

1 person found this answer helpful.
Shree Hima Bindu Maganti 2,185 Reputation points Microsoft Vendor

2025-01-13T03:19:27.1066667+00:00

Hi Kumar, Arun ,Following up to see if you have chance to check my previous response and help us with requested information is helpful.

Kumar, Arun 20 Reputation points

2025-01-13T06:13:13.4733333+00:00

Hi @Shree Hima Bindu Maganti ,

If we set WEBSITE_ENABLE_DIAGNOSTICS to ON. where would the logs be stored? filesystem or blob storage?
If setting is turned ON, is there any default settings which will be considered? If yes, can you pls tell those default settings

Shree Hima Bindu Maganti 2,185 Reputation points Microsoft Vendor

2025-01-13T07:15:54.6+00:00

Hi Kumar, Arun ,
Thanks for your Response.
When the WEBSITE_ENABLE_DIAGNOSTICS setting is set to ON.
Log Storage Location

Logs are stored in the filesystem if no additional configuration is provided.

To store logs in Azure Blob Storage, you must explicitly configure the diagnostic logging settings.
Application Logs: Captures stdout/stderr logs for debugging application-level issues.

Web Server Logs: Records HTTP requests processed by IIS.

Detailed Error Logs: Provides detailed information for troubleshooting HTTP errors.

Default Settings
Logs are retained up to 35 MB of storage; older logs are overwritten when this limit is reached.

Default log level is Warning, unless explicitly configured to capture other levels.
To persist logs, configure Azure Blob Storage as the log destination.

Manage logging settings through. Azure Portal, Azure CLI,ARM Templates.
https://learn.microsoft.com/en-us/azure/app-service/troubleshoot-diagnostic-logs

Shree Hima Bindu Maganti 2,185 Reputation points Microsoft Vendor

2025-01-15T13:55:50.35+00:00

Hi Kumar, Arun ,
Following up to see if you have chance to check my previous response and help us with requested information is helpful.

Shree Hima Bindu Maganti 2,185 Reputation points Microsoft Vendor

2025-01-17T11:56:27.36+00:00

Hi Kumar, Arun ,
Following up to see if you have chance to check my previous response and help us with requested information is helpful.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Share via

Understanding the WEBSITE_ENABLE_DIAGNOSTICS Application Setting

0 additional answers

Your answer