fix(health-check): Return 503 during shutdown to prevent ECONNREFUSED #2674
+133
−47
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- Add opt-in 'failReadinessOnShutdown' (default false)
- Classify fulfilled results with {status:'down'} as errors
- Capture sync throws from indicators via async wrapping
- Status precedence: (shutdown+flag) -> 'error'; else errors -> 'error'; else shutdown -> 'shutting_down'; else 'ok'
- Tests: shutdown behavior (flag on/off), legacy sync-throw, 'down' result classification
Fixes nestjs#2298
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Fixes #2298
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