Docs: how to configure the alert manager

[fabry006]

Can you please tell me how I can configure the mimir alert manager in the mimir-distribuited helm chart? e.g. smtp server for the notifications, alert rules....

[ghost]

@brendamuir @tacole02 Can you have a look at this one and tell me if it's a mimir issue or an alerting issue for assignment? Thanks!

[tacole02]

Hi, @derek-cadzow , I believe this falls within Mimir's territory. I can self-assign.

[tacole02]

@zhehao-grafana could you please comment on whether this issue still requires documentation, and if so, provide a relative priority? Thanks!