Fixed Cadence service monitor additional labels

[pregnor]

Q	A
Bug fix?	yes
New feature?	no
API breaks?	no
Deprecations?	no
Related tickets	resolves #1291
License	Apache 2.0

What's in this PR?

Fixed Cadence service monitor additional labels templating.

Why?

The labels substitution was broken.

Additional context

I used Helm local template generation for testing (helm template cadence cadence from the repository root).

Originally indent was used instead of nindent which together with the extra carriage return in the template and extra indentations broke the resulting YAML after substitution.

# Source: cadence/templates/server-service-monitor.yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: cadence-history
  labels:
    app.kubernetes.io/name: cadence
    helm.sh/chart: cadence-0.21.1
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/instance: cadence
    app.kubernetes.io/version: 0.21.3
    app.kubernetes.io/component: history
    app.kubernetes.io/part-of: cadence    label-1: value-1
    label-2: value-2

I replaced indent with nindent which adds a new line as well before the substitution and that fixed the generated YAML.

# Source: cadence/templates/server-service-monitor.yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: cadence-worker
  labels:
    app.kubernetes.io/name: cadence
    helm.sh/chart: cadence-0.21.1
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/instance: cadence
    app.kubernetes.io/version: 0.21.3
    app.kubernetes.io/component: worker
    app.kubernetes.io/part-of: cadence
    label-1: value-1
    label-2: value-2

Checklist

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

To Do

• Todo (@pregnor): tag patch version.