[WIP] Synchronous Gauge

[lalitb]

Fixes #2279 , #2155

Changes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• [ ] CHANGELOG.md updated for non-trivial changes
• [ ] Unit tests have been added
• [ ] Changes in public API reviewed

[codecov[bot]]

Codecov Report

Merging #2341 (1248928) into main (cb603ad) will decrease coverage by 0.39%. The diff coverage is 55.69%.

:exclamation: Current head 1248928 differs from pull request most recent head 272f30f. Consider uploading reports for the commit 272f30f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2341      +/-   ##
==========================================
- Coverage   87.41%   87.02%   -0.39%     
==========================================
  Files         199      199              
  Lines        6028     6036       +8     
==========================================
- Hits         5269     5252      -17     
- Misses        759      784      +25     

Files	Coverage Δ
api/include/opentelemetry/metrics/meter.h	100.00% <ø> (ø)
api/include/opentelemetry/metrics/noop.h	41.18% <ø> (+3.93%)	:arrow_up:
...i/include/opentelemetry/metrics/sync_instruments.h	100.00% <100.00%> (ø)
sdk/include/opentelemetry/sdk/metrics/meter.h	57.15% <ø> (ø)
...clude/opentelemetry/sdk/metrics/sync_instruments.h	100.00% <ø> (+19.52%)	:arrow_up:
sdk/src/metrics/meter.cc	61.45% <100.00%> (ø)
...etry/sdk/metrics/aggregation/default_aggregation.h	70.13% <0.00%> (ø)
sdk/src/metrics/sync_instruments.cc	65.84% <53.09%> (-13.05%)	:arrow_down:

... and 14 files with indirect coverage changes

[lalitb]

Thanks for taking on the implementation for Gauge.

A few early comments.

Thanks for the comments. Need to add unit-tests before making it ready now.

[lalitb]

closing as there needs a design change. Will raise a new PR.

[yuma-m]

closing as there needs a design change. Will raise a new PR.

Hello @lalitb, Do you have any plan or timeline to add synchronous gauge support for OpenTelemetry SDK C++?

[lalitb]

Hello @lalitb, Do you have any plan or timeline to add synchronous gauge support for OpenTelemetry SDK C++?

Sorry, no timeline yet. It may take a couple of months for me to get back to it. If someone picks it up meanwhile, it would be great.

[yuma-m]

Sorry, no timeline yet. It may take a couple of months for me to get back to it. If someone picks it up meanwhile, it would be great.

@lalitb, Thank you for your answer, got it. As you've closed this as there needs a design change, are there any design documents to refer to?