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What is it?
Alertmanager is the service (and software) in charge of collecting, de-duplicating and sending notifications for alerts across WMF infrastructure. It is part of the Prometheus ecosystem and therefore Prometheus itself has native support to act as Alertmanager client. The alerts dashboard, implemented by Karma, can be reached at https://alerts.wikimedia.org/. As of Jan 2021 the dashboard is available for SSO users only, however a read-only version is possible as well.
Alertmanager is being progressively rolled out as the central place where all alerts are sent, the implementation is done in phases according to the alerting infrastructure roadmap. As of Jan 2021 LibreNMS has been fully migrated, with more services to come.