feature: Health Check Implementation

[raamsri]

Feature Request

Summary

Implement comprehensive health check system covering all Rodent components

Motivation

Current health check is basic and doesn't provide detailed component status. Need more robust health monitoring.

Detailed Design

1. Component Health Checks:

   • ZFS subsystem status
   • Storage pool health
   • API endpoint availability
   • Resource utilization
   • Connection pool status

2. Health Status Format:

   • Component-level status
   • Detailed error information
   • Resource metrics
   • Timestamps

3. Implementation Details:

   • Add component health interfaces
   • Implement health collectors
   • Aggregate health status
   • Add health check endpoints
   • Define status thresholds

Acceptance Criteria

• Each major component reports health status
• Detailed error reporting
• Resource utilization metrics
• Configurable thresholds
• Documentation for health check API

Alternatives

1. Basic up/down check only
2. External monitoring only
3. Log-based health detection

Additional Context

Located in pkg/health/health.go