[Platform Observability] Implement Health Checks and Alerts for Core Services

[KCui0327]

📝 Description:
Implement automated health checks for all critical services and trigger alerts when thresholds are breached. Alerts should be delivered via a Discord Bot in the internal UTMIST Discord Server. Retry logic and escalation rules should ensure alerts are not missed.

🎯 Acceptance Criteria:

• Health checks run automatically and validate service responsiveness and key metrics
• Alerts trigger correctly on threshold breaches and are sent to the Discord Bot channel
• Retry and escalation logic works to ensure alerts are delivered

🛠 Tasks:

• Define health check endpoints
• Set threshold values for metrics
• Configure alert channels, including Discord Bot integration, and escalation rules
• Write tests for health checks, alert triggers, and Discord notifications