SMTP for SigNoz alert notifications not working in self-hosted K8s

The problem

Issue SigNoz/signoz#7580 (closed, 20 comments): On a self-hosted SigNoz in Kubernetes, configuring SMTP for alert notifications does not work. The reporter set the documented variables (SIGNOZALERTMANAGERSIGNOZGLOBALSMTPSMARTHOST, FROM, AUTHUSERNAME, AUTHPASSWORD) via alertmanager additionalEnvs in the helm values, following the configuration docs, and mail still never went out.

What fixed it

Fixed in v0.101.0, per maintainer Nageshbansal (details in SigNoz/signoz#8478). If you are on an older self-hosted release, the SMTP alert path is the thing that is broken, not your values.yaml: upgrade to v0.101.0 or newer first. Then set the SIGNOZALERTMANAGERSIGNOZGLOBALSMTP__* variables as alertmanager additionalEnvs in your helm values (SMARTHOST as host:port, FROM address, AUTH USERNAME and PASSWORD) and the alertmanager picks them up for alert notifications.

In gh:SigNoz/signoz#7580 (SigNoz), the issue reported was: Issue SigNoz/signoz#7580 (closed, 20 comments): On a self-hosted SigNoz in Kubernetes, configuring SMTP for alert notifications does not work. The reporter set the documented variables (SIGNOZALERTMANAGERSIGNOZGLOBALSMTPSMARTHOST, FROM, AUTHUSERNAME, AUTHPASSWORD) via alertmanager additionalEnvs in the helm values, following the configuration docs, and mail still never went out. The verified resolution from the thread: Fixed in v0.101.0, per maintainer Nageshbansal (details in SigNoz/signoz#8478). If you are on an older self-hosted release, the SMTP alert path is the thing that is broken, not your values.yaml: upgrade to v0.101.0 or newer first. Then set the SIGNOZALERTMANAGERSIGNOZGLOBALSMTP__* variables as alertmanager additionalEnvs in your helm values (SMARTHOST as host:port, FROM address, AUTH USERNAME and PASSWORD) and the alertmanager picks them up for alert notifications. Source: mount the host path https at container path //github.com/SigNoz/signoz/issues/7580