What is the maximum number of Alertmanagers that can be added to a Prometheus instance?

Prometheus supports integration withmultiple Alertmanager instancesfor redundancy and high availability. The alerting section of the Prometheus configuration file (prometheus.yml) allows specifyinga list of Alertmanager targets, enabling Prometheus to send alerts to several Alertmanager nodes simultaneously.

There isno hard-coded limiton the number of Alertmanagers that can be added. The typical best practice is to runa minimum of three Alertmanagersin a clustered setup to achieve fault tolerance and ensure reliable alert delivery, but Prometheus can be configured withmore than threeif desired.

Each Alertmanager node in the cluster communicates state information (active, silenced, inhibited alerts) with its peers to maintain consistency.