pub fn check_system_health() -> SystemHealthExpand description
Check system resources and return health status.
Monitors file descriptor usage and CLOSE_WAIT socket count.
- Below 70% FD usage and <200 CLOSE_WAIT: Healthy
- 70-80% FD usage or 200-500 CLOSE_WAIT: Degraded
- Above 80% FD usage or >500 CLOSE_WAIT: Unhealthy