Deep DivesJuly 12, 2026·8 min read

Health Checks Deep Dive: How They Actually Work

Technical deep dive into health check mechanisms, thresholds, and failure detection.

Mechanism

Periodic HTTP request to health endpoint. Success = 200. Failure = 5xx/timeout/refused.

Thresholds

Unhealthy: N consecutive failures before removal.

Healthy: N consecutive successes before restoration.

Failure Types

  • 5xx server errors
  • Connection refused
  • Timeout
  • DNS resolution failure

Timing

IntervalDetection Time
|----------|---------------|

10s20-30s
30s60-90s
60s120-180s

#health checks#technical#deep dive

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