[prometheus-mysql-exporter] multipleTarget.targets does not take effect

[zhangzx1996]

Describe the bug a clear and concise description of what the bug is.

I deploy mysql-exporter by helm in k8s. And I want this exporter scrape two mysql instance.
I was configed serviceMonitor.targets as follow:

serviceMonitor:
  multipleTarget:
    enabled: true
    targets:
      - endpoint: 172.30.0.10
        name: self-mysql
        port: 3307
        user: exporter1
        password: password
      - endpoint: 172.30.0.10
        name: exporter2
        port: 3306
        user: exporter2
        password: password

After exectu Helm install, there is a my.cnf look as this

      [client.beta-mysql]
      host=localhost
      port=3306
      user=exporter
      password=password
      [client.self-mysql]
      user=exporter1
      password=password
      [client.dev-mysql]
      user=exporter2
      password=password

What's your helm version?

2.6.1

What's your kubectl version?

kubephere. v3.3.2

Which chart?

Prometheus-mysql-exporter

What's the chart version?

0.15.1

What happened?

No response

What you expected to happen?

No response

How to reproduce it?

No response

Enter the changed values of values.yaml?

No response

Enter the command that you execute and failing/misfunctioning.

The iphost I config in the targets[0].endpoint is not effect.

Anything else we need to know?

No response