Add route tag to metrics as well as traces when using otelhttp.WithRouteTag.

[charleskorn]

Resolves https://github.com/open-telemetry/opentelemetry-go-contrib/issues/611.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: charleskorn / name: Charles Korn (4e27aed5a192320639bc682f95551ba3e7aa611e, 9d4cbe21a6610cacf5ad92e91cafa3cdb7f18c36, 6882ec97d3ada5f5e81b77784d76755df80587e5, fc1ec77be3b995364c1cabd73d9dd447457d2322)
• :white_check_mark: login: pellared / name: Robert Pająk (863b0b8cf7ff361a9162e9ab8be2434d7110d6a9, 4c7f4eb2a0cb778162699b4f6f091528d6718ce8, 8987d759bd07e0e91106076d44fe79f40962aef2, a796aaeef4b281b972d6f37330cba53fca1b1924, be400d8f0d035adb05aa6629733d7c48bfc42384, 7b783c4e68e22b5f7438bea1cbc6ddbfc554bb59, 51482d616ad215eec4ac2f605f48332e1f1d7191, d6ae09e3a7f52ef9b519bb0df3badfd34edab2e2)

[codecov[bot]]

Codecov Report

Merging #615 (d6ae09e) into main (bf2ae27) will increase coverage by 0.0%. The diff coverage is 100.0%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #615   +/-   ##
=====================================
  Coverage   79.3%   79.4%           
=====================================
  Files        165     165           
  Lines      10318   10324    +6     
=====================================
+ Hits        8183    8198   +15     
+ Misses      2000    1992    -8     
+ Partials     135     134    -1     

Files Changed	Coverage Δ
instrumentation/net/http/otelhttp/handler.go	86.9% <100.0%> (+3.8%)	:arrow_up:

... and 1 file with indirect coverage changes

[charleskorn]

Would it be possible to get a review on this? I'd love to see this functionality implemented.

[RangelReale]

I'm also needing something like this.

[changliu-wk]

Any concerns about the change? Really want to have this feature. @charleskorn

[pellared]

@charleskorn Can you update the PR? Sorry for the delay.

[charleskorn]

@charleskorn Can you update the PR? Sorry for the delay.

No worries, done!

[pellared]

@charleskorn Thanks for your contribution 🎉

[pellared]

I am planning to merge this PR. There are only some problems with EasyCLA integration which is blocking this PR. This problem affects other PRs as well.