fix tests. new product advisories enhancements

docs/notifications/operations/retries.md

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+# Notification Retries
+
+This document describes the retry mechanism for failed notification deliveries.
+
+## Overview
+
+The retry system ensures reliable notification delivery even when temporary failures occur.
+
+## Retry Strategy
+
+### Exponential Backoff
+- Initial delay: 5 seconds
+- Maximum delay: 1 hour
+- Backoff multiplier: 2x
+
+### Retry Limits
+- Maximum attempts: 10
+- Maximum retry duration: 24 hours
+
+### Retry Conditions
+- Network errors: Always retry
+- HTTP 5xx errors: Always retry
+- HTTP 429 (rate limit): Retry with Retry-After header
+- HTTP 4xx errors: Do not retry (permanent failure)
+
+## Dead Letter Queue
+
+Notifications that exceed retry limits are moved to the dead letter queue for:
+- Manual inspection
+- Automatic alerting
+- Scheduled reprocessing
+
+## Monitoring
+
+Retry metrics are exposed for:
+- Retry count per notification
+- Success rate after retries
+- Average retry duration