Low allocation OTLP logs marshaler

[jack-berg]

Continuation of #6410, #6422

Benchmark                                                              Mode  Cnt     Score    Error   Units
LogsRequestMarshalerBenchmark.marshalStateful                          avgt   10     1.213 ±  0.013   us/op
LogsRequestMarshalerBenchmark.marshalStateful:gc.alloc.rate            avgt   10  2359.345 ± 24.972  MB/sec
LogsRequestMarshalerBenchmark.marshalStateful:gc.alloc.rate.norm       avgt   10  3000.001 ±  0.001    B/op
LogsRequestMarshalerBenchmark.marshalStateful:gc.count                 avgt   10    40.000           counts
LogsRequestMarshalerBenchmark.marshalStateful:gc.time                  avgt   10    19.000               ms
LogsRequestMarshalerBenchmark.marshalStatefulJson                      avgt   10     3.598 ±  0.067   us/op
LogsRequestMarshalerBenchmark.marshalStatefulJson:gc.alloc.rate        avgt   10  1520.504 ± 28.543  MB/sec
LogsRequestMarshalerBenchmark.marshalStatefulJson:gc.alloc.rate.norm   avgt   10  5736.002 ±  0.001    B/op
LogsRequestMarshalerBenchmark.marshalStatefulJson:gc.count             avgt   10    25.000           counts
LogsRequestMarshalerBenchmark.marshalStatefulJson:gc.time              avgt   10    12.000               ms
LogsRequestMarshalerBenchmark.marshalStateless                         avgt   10     1.325 ±  0.014   us/op
LogsRequestMarshalerBenchmark.marshalStateless:gc.alloc.rate           avgt   10    51.798 ±  0.552  MB/sec
LogsRequestMarshalerBenchmark.marshalStateless:gc.alloc.rate.norm      avgt   10    72.001 ±  0.001    B/op
LogsRequestMarshalerBenchmark.marshalStateless:gc.count                avgt   10     1.000           counts
LogsRequestMarshalerBenchmark.marshalStateless:gc.time                 avgt   10     1.000               ms
LogsRequestMarshalerBenchmark.marshalStatelessJson                     avgt   10     3.487 ±  0.092   us/op
LogsRequestMarshalerBenchmark.marshalStatelessJson:gc.alloc.rate       avgt   10   485.766 ± 12.691  MB/sec
LogsRequestMarshalerBenchmark.marshalStatelessJson:gc.alloc.rate.norm  avgt   10  1776.002 ±  0.001    B/op
LogsRequestMarshalerBenchmark.marshalStatelessJson:gc.count            avgt   10     8.000           counts
LogsRequestMarshalerBenchmark.marshalStatelessJson:gc.time             avgt   10     4.000               ms

[jack-berg]

cc @laurit

[codecov]

Codecov Report

Attention: Patch coverage is 85.21401% with 38 lines in your changes are missing coverage. Please review.

Project coverage is 90.84%. Comparing base (414cc7b) to head (613e31c).
Report is 3 commits behind head on main.

Files	Patch %	Lines
...rnal/otlp/AttributeKeyValueStatelessMarshaler.java	72.72%	6 Missing and 6 partials ⚠️
...rter/internal/otlp/logs/LogStatelessMarshaler.java	82.60%	8 Missing and 4 partials ⚠️
...rter/internal/otlp/AnyValueStatelessMarshaler.java	89.74%	2 Missing and 2 partials ⚠️
...otlp/AttributeArrayAnyValueStatelessMarshaler.java	76.47%	2 Missing and 2 partials ⚠️
...l/otlp/logs/LowAllocationLogsRequestMarshaler.java	76.47%	3 Missing and 1 partial ⚠️
...rter/internal/otlp/KeyValueStatelessMarshaler.java	77.77%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6429      +/-   ##
============================================
- Coverage     90.85%   90.84%   -0.02%     
- Complexity     6028     6080      +52     
============================================
  Files           651      660       +9     
  Lines         17729    17928     +199     
  Branches       1777     1787      +10     
============================================
+ Hits          16107    16286     +179     
- Misses         1105     1118      +13     
- Partials        517      524       +7     

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[laurit]

In the future, if needed, we could probably get rid of allocating a new byte array here.