[hotrod/observer_test] Switch to OpenTelemetry

[afzal442]

Which problem is this PR solving?

• Part of Upgrade internal use of tracing to OpenTelemetry #3381
• This PR adds otel traces and const to hotROD test file

Short description of the changes

• Replace OT const with otel trace spans const i.e. ext.SpanKind.. with trace.SpanKind.. and its trace API

[sbin64]

Thanks again. But I am wondering why our test is still failing.

…

On Thu 10 Aug, 2023, 11:33 PM Yuri Shkuro ***@***.*** wrote: ***@***.**** commented on this pull request. ------------------------------ In examples/hotrod/pkg/tracing/rpcmetrics/observer_test.go <#4635 (comment)> : > @@ -109,20 +103,17 @@ func TestTags(t *testing.T) { key string variant string that means it's not used, that link is still initialization path — Reply to this email directly, view it on GitHub <#4635 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AWUUWLVIB3BKAZJR26MCPJDXUUO7XANCNFSM6AAAAAA3HMVMPY> . You are receiving this because you commented.Message ID: ***@***.***>

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.03% ⚠️

Comparison is base (5b9e7e1) 97.06% compared to head (cefff81) 97.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4635      +/-   ##
==========================================
- Coverage   97.06%   97.04%   -0.03%     
==========================================
  Files         301      301              
  Lines       17878    17878              
==========================================
- Hits        17354    17350       -4     
- Misses        420      423       +3     
- Partials      104      105       +1     

Flag	Coverage Δ
unittests	97.04% <100.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
model/span.go	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.