What is egg-logger-sls?

egg-logger-sls is a plugin for Egg.js applications that automatically sends your application logs to Alibaba Cloud's Simple Log Service (SLS). Instead of logs only being saved to files on your server, this tool ships them to a centralized cloud logging platform where you can more easily search, analyze, and monitor what is happening in your application. Once installed and configured, the plugin runs in the background. Whenever your application code writes a log entry, like recording an error or tracking a user action, the plugin captures that entry and uploads it to your SLS account. You provide your cloud credentials and specify which SLS project and log store to use. From there, it handles the delivery automatically. You can also control which logs get sent: you can disable specific loggers from being uploaded, and you can write a custom filter function to drop certain logs or modify the data before it leaves your server. This is built for teams already using Egg.js as their web framework and Alibaba Cloud for their infrastructure. For example, if you run an e-commerce site and want to centralize error tracking across multiple servers, this plugin lets you send all those errors to one cloud dashboard instead of SSHing into individual machines to read text files. It is particularly useful for teams operating several servers who need a single place to search and analyze their application's behavior. The data sent to the cloud includes useful context automatically: the log's severity level, the message content, the server's IP and hostname, the application name, and which specific logger generated the entry. The plugin also introduces a custom slsLevel setting, letting you control the verbosity of cloud-uploaded logs independently from your local file logs. This means you could save disk space locally by only writing errors to files, while sending more verbose debug information to the cloud for analysis.