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Prometheus Alertmanager vs Robusta: catalog facts
Prometheus Alertmanager	Robusta
Free Free and open source as part of the Prometheus project.	Free The open-source project is free to install in your own cluster.
Self-hosted	Self-hosted
Groups hundreds of related alerts into one notification Silencing and inhibition to cut alert noise	Groups related Prometheus alerts to cut noise Adds cluster context to each alert
Configured through files rather than a full graphical interface Designed around Prometheus and its alerting rules	Only relevant for Kubernetes and Prometheus setups AI enrichment features may depend on external services
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.