Comprehensive System and Server Monitoring

I'm in need of a comprehensive monitoring system that can track the performance, security, and usage of our network.

Performance Monitoring:
- Keep an eye on the system's response time
- Monitor the server load
- Track the resource utilization

Security Monitoring:
- Implement Intrusion detection
- Keep track of authentication logs

The ideal freelancer should have:
- Extensive experience in network monitoring and management
- In-depth knowledge of performance, security, and usage monitoring tools
- Strong understanding of security measures like intrusion detection and authentication log monitoring