add-additional-prometheus-configs

First, you will need to create the additional configuration. Below we are making a simple "prometheus" config. Name this prometheus-additional.yaml or something similar.

```
- job_name: "prometheus"
  static_configs:
  - targets: ["localhost:9090"]
```

Then you will need to make a secret out of this configuration.

```
oc create secret generic additional-scrape-configs --from-file=prometheus-additional.yaml --dry-run -oyaml > additional-scrape-configs.yaml
```
Next, create a new secret using the base64 encoded output as the value for prometheus-additional.yaml in the secret.

```
apiVersion: v1
data:
  prometheus-additional.yaml: LSBqb2JfbmFtZTogInByb21ldGhldXMiCiAgc3RhdGljX2NvbmZpZ3M6CiAgLSB0YXJnZXRzOiBbImxvY2FsaG9zdDo5MDkwIl0K
kind: Secret
metadata:
  creationTimestamp: null
  name: additional-scrape-configs
```

Finally, reference this additional configuration in your prometheus.yaml CRD.

```
apiVersion: monitoring.coreos.com/v1
kind: Prometheus
metadata:
  name: prometheus
  labels:
    prometheus: prometheus
spec:
  replicas: 2
  serviceAccountName: prometheus
  serviceMonitorSelector:
    matchLabels:
      team: frontend
  additionalScrapeConfigs:
    name: additional-scrape-configs
    key: prometheus-additional.yaml
...