senke d4e9cd7175 api-contracts: add validation error alerting for high failure rates ... - Created ValidationAlerting class to monitor validation metrics - Alerts when failure rate exceeds threshold (default 5%) - Periodic checks every 5 minutes (configurable) - Cooldown period (15 min) to prevent alert spam - Minimum validations required (10) before alerting - Structured alert logging with full metrics context - Automatically starts in production (can be disabled via env var) - Alerts sent to backend logging and Sentry - Action 1.2.2.4 complete - validation alerting now active for monitoring		2026-01-15 17:23:01 +01:00
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web	api-contracts: add validation error alerting for high failure rates	2026-01-15 17:23:01 +01:00