LogData nullable spanId, traceId

[jack-berg]

Was working on a prototype Log4j2 appender, and noticed that protobuf marshaling fails if spanId / traceId are left to their default blank values.

I've updated LogData to reflect that spanId and traceId are optional, and updated the marshaler to work with nullable values.

Will likely to make other fields on LogData nullable as well.

[jack-berg]

This test fails without the updates to the marshaler.

[codecov]

Codecov Report

Merging #3745 (c2259ed) into main (69d26c1) will increase coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #3745      +/-   ##
============================================
+ Coverage     89.18%   89.30%   +0.11%     
- Complexity     3870     3875       +5     
============================================
  Files           463      463              
  Lines         12125    12123       -2     
  Branches       1188     1188              
============================================
+ Hits          10814    10826      +12     
+ Misses          916      908       -8     
+ Partials        395      389       -6     

Impacted Files	Coverage Δ
...etry/exporter/otlp/internal/logs/LogMarshaler.java	66.66% <ø> (ø)
.../io/opentelemetry/sdk/logs/LogSinkSdkProvider.java	100.00% <ø> (ø)
...java/io/opentelemetry/sdk/logs/data/LogRecord.java	100.00% <ø> (ø)
.../opentelemetry/sdk/logs/data/LogRecordBuilder.java	93.54% <ø> (-0.40%)	⬇️
...telemetry/sdk/trace/export/BatchSpanProcessor.java	90.78% <0.00%> (+0.70%)	⬆️
...elemetry/exporter/otlp/internal/MarshalerUtil.java	93.25% <0.00%> (+2.24%)	⬆️
...entelemetry/exporter/otlp/internal/Serializer.java	84.05% <0.00%> (+2.89%)	⬆️
...ntelemetry/sdk/extension/resources/OsResource.java	90.69% <0.00%> (+4.65%)	⬆️
...ava/io/opentelemetry/sdk/internal/RateLimiter.java	100.00% <0.00%> (+5.88%)	⬆️
...metry/sdk/extension/resources/ProcessResource.java	87.50% <0.00%> (+6.25%)	⬆️
... and 2 more

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[jkwatson]

👍🏽