Add grafana integration

[RTJL]

What does this PR do?

Create a new integration for Grafana.

Motivation

What inspired you to submit this pull request?

I want to use Datadog to monitor the status of Grafana instances without exporting as custom metrics.

Review checklist

• PR has a meaningful title or PR has the no-changelog label attached
• Feature or bugfix has tests
• Git history is clean
• If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo
• If this PR includes a log pipeline, please add a description describing the remappers and processors.

Additional Notes

Anything else we should know when reviewing?

[rtrieu]

Thanks for your PR! I've left you some feedback and suggestions mainly around consistency and clarity.

[RTJL]

hi @rtrieu, could i trouble you to take a look at it again? thanks!

[NouemanKHAL]

Hi @RTJL ,
Thank you for your contribution! I reviewed your PR, overall everything LGTM!
I left few comments to address CI validation errors and some nits.

Review from rtrieu is dismissed. Related teams and files:

• documentation
  • grafana/README.md

[RTJL]

hi @NouemanKHAL, have applied the suggestions and also rebased. can help take a look at it again? thanks!

[NouemanKHAL]

@RTJL Are there any metric tags that should be renamed instead?
If needed, you can follow the example here to add a rename_labels key to the config map, and add the mapping for tag and renamed_tag.

Example:
https://github.com/DataDog/integrations-core/blob/a41670ab152f0e49bd6b01833580a42951550ae5/linkerd/datadog_checks/linkerd/check.py#L30

[RTJL]

hi @NouemanKHAL, I've reviewed the metric tags and renamed the ones that were needed using the rename_labels mapping in the config, following the same pattern as the example you shared.

Review from rtrieu is dismissed. Related teams and files:

• documentation
  • grafana/README.md
  • grafana/manifest.json
  • grafana/metadata.csv