PCA (Prometheus Certified Associate) sample exam question with answer 412

Question:
What is necessary for a high-availability setup of Alertmanager? (Select all that apply.)

1. Configuring alerting clients to send to a single, static instance of Alertmanager
2. Configuring the instances of Alertmanager to expose port 9094
3. Configuring the instances of Alertmanager with the addresses of their peers
4. Running multiple instances of Alertmanager

Answer:
B, C, D - correct answers. More at high-availability1 and high-availability2
A - is incorrect as this is not necessary for a high-availability (HA) setup of Alertmanager. In fact, this runs counter to high availability as no alert notifications will be able to be delivered if the one Alertmanager instance that Prometheus is pointed at goes down. Thus, as part of an HA setup, Prometheus should be configured to send alerts to all instances of Alertmanager