---
title: "Logging: Best practices"
description: "Here are some best practices to ensure your logs are structured, accessible, and optimized for performance: ## **Separate Logs by Vault** Store logs for each vault in a dedicated folder to simplify locating relevant information when troubleshooting or analyzing activities.…"
url: "https://extensionkit.unitfly.com/documentation/logging-best-practices/"
updated: "2025-07-17"
category: Configurations / Logging
---

# Logging: Best practices

Here are some best practices to ensure your logs are structured, accessible, and optimized for performance:

## **Separate Logs by Vault**

Store logs for each vault in a dedicated folder to simplify locating relevant information when troubleshooting or analyzing activities.

## **Use the Appropriate Logging Level**

For normal system operation, it’s best to use the **Info** logging level for a balance of detail and performance.

## **Customize File Log Format**

Define a clear and consistent log format for easier readability and analysis. In the **Advanced Settings** of the File Targets configuration, you can customize log formatting. If you want to maintain the formatting of previous log structures (pre-v5.0.0), we recommend using the following custom Log Message Format:

`${longdate} [${level:uppercase=true:padding=3}] ${logger} [Task: ${mdlc:TaskID}] [${mdlc:ModuleName}] ${mdlc:Vault} ${mdc:Rules} ${message}${onexception:${newline}${exception:format=ToString:innerformat=ToString:separator=rn}}`

For more details, refer to this page: [Version 5.0.0 of Extension Kit for M-Files released! – Announcements – Unitfly Community](https://toolkitformfiles.unitfly.com/community/annonucements/version-5-0-0-of-extension-kit-for-m-files-released/#post-146).

## **Set a Log Retention Period**

Define the retention period for logs based on the specific needs of each vault. This helps manage storage while retaining essential data for audits or debugging.

## **Define Maximum File Size**

It’s crucial to set a maximum file size to ensure logs remain accessible and can be easily opened and reviewed, especially if you use a one-file-per-day configuration.