Setup alerts for various billing cronjobs

[naved001]

We have kubernetes cronjobs running on 2 openshift clusters.

1. nerc-shift-1: OpenStack, Storage, Daily Billing,
2. nerc-ocp-prod openshift cluster: OpenShift metrics collection, OpenShift reporting.

We want to get alerts when a job fails.

Here are some options:

1. The obs clusters alertmanager can be configured to send alerts to our own slack channel. However, the obs cluster only has metrics from the nerc-ocp-prod. We will need to connect it to nerc-shift-1 so we can get metrics for all our cronjobs.

2. Configure the alertmanager in nerc-shift-1 to send alerts to our slack channel. Currently, we get alerts from the cluster about everything that go into p-nerc. Alerts for openshift reporting can still come from the obs cluster.