What's in this PR?

Add a missing newline to Prometheus Operator's ServiceMonitor template

Why?

ServiceMonitor template was producing invalid yaml output, because of missing newline. This case only pops-up when you try to use relabelling. nindent is used instead of indent to fix the issue.

Additional context

The issue can be reproduced and tested with the following commands:

1. first go to cadence folder and build Helm deps

cd cadence
helm dependency build

2. Then try to use relabelling:

#!/bin/bash

helm template \
--set server.metrics.serviceMonitor.enabled=true \
--set server.metrics.serviceMonitor.relabellings[0].sourceLabels={__address__}  \
--set server.metrics.serviceMonitor.relabellings[0].targetLabel=new_label  \
--set server.metrics.serviceMonitor.relabellings[0].replacement=new-value  \
cadence . | grep ServiceMonitor -A20

Related resources:

• https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config
• https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/api.md#relabelconfig

Checklist

• Code meets the Developer Guide
• User guide and development docs updated (if needed)
• Related Helm chart(s) updated (if needed)