What Is a Health Check Grace Period?
A health check grace period is a configured delay after an instance or container launches before the load balancer or scheduler starts acting on failing health checks. It exists because an application often needs time to warm up before it can pass checks. During the grace period the instance is not marked unhealthy or replaced.
Why it matters
Without a grace period, slow-starting services get killed and restarted in a loop before they ever come up. Tuning it correctly is key to stable deploys of apps with long initialization.
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