Send Prometheus alerts to Slack

[Archisman-Mridha]

I have used Kube Prometheus Stack helm chart to deploy Prometheus, Grafana and AlertManager to the Kubernetes cluster for observability. It will be really nice if AlertManager can push alerts to Slack.

Kube Prometheus Stack related files can be found here.

Approach

Create a Kubernetes Secret containing required AlertManager configs. Refer that Kubernetes Secret in the Kube Prometheus Stack helm installation values.

NOTE - Kube Prometheus Stack provides some useful AlertManager configs by default. If we follow the above approach, then those default configs will be ignored. Only configurations mentioned in the Kubernetes Secret will be loaded into the AlertManager pods.