sdk: Update sampling documentation

[hdost]

• Move Sampling header into Sampler
• Enrich classes to have links in tracing module

Relates #800

Signed-off-by: Harold Dost github@hdost.com

[hdost]

@TommyCpp barring the obvious failures is this a good direction for #800?

[TommyCpp]

@TommyCpp barring the obvious failures is this a good direction for #800?

Yeah I think it's a good start on docs, Thanks! I think we should sample at every span to be consistent with other SDKs.

This has a risk of breaking change as the current behavior will be Parent<SubSampler> but I think it's worth it.

[jtescher]

Yeah we should follow the spec's steps here https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#sdk-span-creation

[codecov]

Codecov Report

Merging #807 (2e5a6c3) into main (c13a11e) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #807   +/-   ##
=====================================
  Coverage   68.7%   68.8%           
=====================================
  Files        115     115           
  Lines       9397    9397           
=====================================
+ Hits        6465    6470    +5     
+ Misses      2932    2927    -5     

Impacted Files	Coverage Δ
opentelemetry-sdk/src/trace/provider.rs	85.5% <ø> (ø)
opentelemetry-sdk/src/trace/sampler.rs	93.4% <ø> (ø)
opentelemetry-jaeger/src/exporter/mod.rs	53.8% <0.0%> (+2.5%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c13a11e...2e5a6c3. Read the comment docs.

[TommyCpp]

Looks good. Thanks!