Forwardport from grafana-operator v3 the json data field implementation for Alertmanager Datasource.

[Cellebyte]

Description

Relevant issues/tickets

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• This change requires a documentation update
• I have added tests that prove my fix is effective or that my feature works
• I have added a test case that will be used to verify my changes
• Verified independently on a cluster by reviewer

Verification steps

[Cellebyte]

This adds more support to configure the Alertmanager Datasource with the [unified_alerting] from #559

[hubeadmin]

LGTM overall, one small nitpick

[Cellebyte]

@HubertStefanski what is the small nitpick, when I click on the link it is not showing it up :D

[hubeadmin]

Ahh, you caught it 😅 , not sure why it didn't show up, but it was that new line at EOF for the example .yaml, thanks @Cellebyte 👍

[NissesSenap]

More information can be found: https://grafana.com/docs/grafana/latest/datasources/alertmanager/

[NissesSenap]

Thanks allot @Cellebyte and thanks for all that you do for the community by managing the grafana-operator helm chart for us.