Map Zendesk unsupported ticket errors to 400 instead of 500

[vijaygupta18]

🤖 Argus proposed fix

Fix confidence: HIGH (score 0.85)
Reasons: RCA high-confidence, exact line identified, confirmed pattern matched, localized diff (1f/12l)

Root cause

The kapturePullTicket and related ticket interface functions in shared-kernel unconditionally throw InternalError when ZendeskConfig is active. InternalError maps to HTTP 500, which inflates ALB 5xx counts even though this is a configuration/client-side mismatch, not a server failure. Changing to InvalidRequest maps it to HTTP 400, removing it from 5xx alerting.

Evidence

see RCA

Rollback

Revert the commit or change InvalidRequest back to InternalError in lib/mobility-core/src/Kernel/External/Ticket/Interface.hs

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