How to configure alert rule notifications to display informational values not C0=30, C1=28

[jangaraj]

Don’t use classic condition, but math condition.

Define meaningful annotation:

Accessing Query Expression Results for Custom Notification Templates in Managed Grafana Alerts

so B value(s) will be {{ index $values "B" }} or {{ $values.B }}. But this is not a task for notification template. You should use it in the alert annotation, e.g. meaningful description: Pod: {{ $labels.container }} in namespace: {{ $labels.namespace }} on cluster: {{ $labels.kubernetes_cluster }} has high CPU utilization: {{ humanize $values.B.Value }}% and notification template just use that annotation.

So then you may complain that you have a lot of rubbish in the email (also with that meaningful annotation): then define custom notification template to have only that annotation in the email:

Create notification templates | Grafana documentation

Doc is your friend.