That's a very clear error message. Alertmanager is trying to make a connection to grafana.s.com port 25 (SMTP for sending mail), and it can't. Possibly the connection is being blocked by firewall rules.
You can test it by hand: telnet grafana.s.com 25 and then fix your network until it works. -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/c8067069-88d3-4479-89d0-bb0480e81147o%40googlegroups.com.
