[FEATURE REQ] [Thin Client][Gateway V2] Connect timeout bifurcation — 1s for thin client proxy (port 10250) vs 45s for gateway (port 443)

[jeet1995]

Summary

Thin client proxy (Gateway V2, port 10250) is co-located and should respond to TCP SYN-ACK in <10ms. The default 45s connect timeout masks proxy outages. Bifurcate to 1s for GW V2, keep 45s for GW V1.

Implementation Status

• Branch: AzCosmos_H2ConnectAcquireTimeout
• Per-request CONNECT_TIMEOUT_MILLIS via reactor-netty immutable .option()
• 3/3 iptables DROP SYN tests passed — 3 gateway stats entries in 3s budget proves 1s timeout
• PR not yet created

Acceptance Criteria

• PR created and merged
• GW V2 (port 10250): 1s connect timeout
• GW V1 (port 443): 45s connect timeout (unchanged)
• Metadata requests to port 443 unaffected
• Configurable via system property as fallback

GA Blocker: Yes

[github-actions]

@g2vinay @joshfree

[github-actions]

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