feat: Implement load balancing and health check features for service groups, including DNS-based load balancing modes and health check configurations, enhancing service reliability and performance monitoring

apps/api/src/config.ts

@@ -10,6 +10,10 @@ export interface AppConfig {
   serverPort: number;
   staticDir: string | null;
   certCheckCron: string;
+  healthCheckCron: string;
+  healthDegradedFailures: number;
+  healthDownFailures: number;
+  healthLatencyWarnMs: number;
   logLevel: string;
 }
 
@@ -27,6 +31,12 @@ export function loadConfig(): AppConfig {
       ? resolve(process.env.STATIC_DIR)
       : null,
     certCheckCron: process.env.CERT_CHECK_CRON ?? "0 0 */6 * * *",
+    healthCheckCron: process.env.HEALTH_CHECK_CRON ?? "*/30 * * * * *",
+    healthDegradedFailures:
+      Number(process.env.HEALTH_DEGRADED_FAILURES ?? "1") || 1,
+    healthDownFailures: Number(process.env.HEALTH_DOWN_FAILURES ?? "2") || 2,
+    healthLatencyWarnMs:
+      Number(process.env.HEALTH_LATENCY_WARN_MS ?? "1000") || 1000,
     logLevel: process.env.LOG_LEVEL ?? "info",
   };
 }