Add metrics overflow warning to the dashboard

[JamesNK]

Description

Fixes #7520

I didn't spend any time styling the warning. Most people will never see this so IMO it's not important we make it look perfect.

New:

Old:

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

[Copilot]

Copilot reviewed 19 out of 19 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

src/Aspire.Dashboard/Otlp/Model/OtlpInstrument.cs:31

• Consider adding unit tests for HasOverflowDimension to cover scenarios with dimensions that do and do not contain the overflow attribute, ensuring correct behavior in both cases.

public static bool HasOverflowDimension(List<DimensionScope> dimensions)

[JamesNK]

cc @samsp-msft @cijothomas

[cijothomas]

Thanks for continuously adding more OpenTelemetry features to Aspire! ❤️
As far as I know, this capability doesn’t exist anywhere else, not even in Prometheus/Grafana.
Great to see Aspire leading the way!

(I plan to showcase this in a tutorial/blog about Cardinality Capping in OTel)

[JamesNK]

Thanks for continuously adding more OpenTelemetry features to Aspire! ❤️ As far as I know, this capability doesn’t exist anywhere else, not even in Prometheus/Grafana. Great to see Aspire leading the way!

(I plan to showcase this in a tutorial/blog about Cardinality Capping in OTel)

If it's shown off in tutorials/blogs then I'll put a little more effort into styling. I've updated it to look better.