mention another prometheus example using Grafana

[bamarni]

The GUI part of the blog post example seems not much relevant anymore, there are some nice starter projects from @vegasbrianc that could be interesting to mention here.

[k8s-ci-robot]

Hi @bamarni. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with @k8s-bot ok to test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

If you have questions or suggestions related to this bot's behavior, please file an issue against the kubernetes/test-infra repository.

[googlebot]

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[bamarni]

I signed it!

[googlebot]

CLAs look good, thanks!

[timstclair]

Thanks!