Get Alert from Cortex / Loki rules

Hey Everyone!
I am using Prometheus and grafan install using helm chart on Kubernetes.
Version - v8.4.2 (dea7d4996a)
Everything looks fine but i am not getting alert notification on my slack channel as i am expecting alerts from Cortex / Loki rules instead Grafana custom rule.
how can i achieve it?
Also need to know abut smtp configuration as when i tried to modify grafana.ini i am getting permission issue.

Cortex / Loki rules
216 rules: 8 firing, 1 pending, 118 normal, 89 recording