feat: add metric_collector tool for remote server monitoring

[opsworld30]

Add a new tool that connects to remote servers via SSH to collect and monitor system metrics. This tool enables users to gather performance data and system statistics from remote machines for monitoring and analysis purposes.

Plugin Submission Form

1. Submission Type

• New plugin submission
• Version update for existing plugin

2. Description

Metric Collector is a tool that connects to remote servers via SSH to collect system metrics. It helps users monitor key system indicators such as CPU usage, memory utilization, disk space, network traffic, and other vital system metrics, enabling timely detection of performance issues and resource bottlenecks.

3. Checklist

• I have read and followed the Publish to Dify Marketplace guidelines
• I have read and comply with the Plugin Developer Agreement
• I confirm my plugin works properly on both Dify Community Edition and Cloud Version
• I confirm my plugin has been thoroughly tested for completeness and functionality
• My plugin brings new value to Dify

4. Documentation Checklist

Please confirm that your plugin README includes all necessary information:

• Step-by-step setup instructions
• Detailed usage instructions
• All required APIs and credentials are clearly listed
• Connection requirements and configuration details

5. Privacy Protection Information

Based on Dify Plugin Privacy Protection Guidelines:

Data Collection

This plugin does not collect personal user data. It only collects system metric data from user-specified remote servers, such as CPU usage, memory utilization, and disk space. Users need to provide server connection information (hostname/IP address, port, username, and password/key) which is only used for establishing SSH connections and is not stored or transmitted to third parties.

Privacy Policy

• I confirm that I have prepared and included a privacy policy in my plugin package based on the Plugin Privacy Protection Guidelines