Default metrics dashboards

[estolfo]

Let's make sure metrics dashboards are shown for the OTel distro in the Metrics tab and that the metrics shown are meaningful. This task might also require some UI task coordination and portable dashboard work.
If work was done for this issue, it's possible some of it could be reused.

[stevejgordon]

@estolfo. Is this a dupe of #59?

[estolfo]

Yes, looks like it. I'll close this in favor of the other.

[estolfo]

duplicate of #59