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* Alerting: Improve notification policies created during migration Previously, migrated legacy alerts were connected to notification policies through a `rule_uid` label in a 1:1 fashion. While this correctly mimicked pre-migration routing, it didn't create a notification policy structure that is easy to view/modify. In addition, having one policy per migrated alert is, in some ways, counter to the recommended approach of Unified Alerting. This change replaces `rule_uid`-based migrated notification policies with a private label called `__contacts__`. This label stores a list of double quoted strings containing the names of all contact points an AlertRule should route to (based on legacy notification channels). Finally, one notification policy is created per contact point with each matching AlertRules via regex on this `__contacts__` label. The result is a simpler, clearer, and easier to modify notification policy structure, with the added benefit that you can see which contact points an AlertRule is being routed to from the AlertRule creation page.
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