api-gateway health endpoint responds 200 even when some dependents fail

[therealjhay]

ProblemThe gateway /health returns 200 if it itself is up, ignoring downstream (DB, Redis, Horizon) status, so load balancers keep traffic flowing to a degraded gateway.

1. Downstream failures don't affect status code.
2. No readiness vs liveness split.
3. LB keeps routing.

Solution

• Return 503 for readiness when critical dependents fail.
• Separate liveness from readiness.
• Test the 503 path.

Acceptance Criteria

• Degraded gateway reports 503 on readiness.
• Liveness stays 200.
• pnpm --filter api-gateway build passes.

Note for Contributors: Write a clear PR description. Show the readiness 503.

[Duyicoda]

@Duyicoda has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi. I have reviewed this issue and would like to work on it.

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[TheCodingChef-eth]

@TheCodingChef-eth has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer, I can handle this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @TheCodingChef-eth to this issue.

[drips-wave]

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