Output severity text in SystemOutLogRecordExporter

[thswlsqls]

Fixes #8712

Description

• SystemOutLogRecordExporter.formatLog() prints the severity number but drops LogRecordData.getSeverityText().
• Appends [severityText: ...] after the severity and before [eventName: ...], matching the OTLP field order (severity_number → severity_text → ... → event_name).
• The OTLP marshalers (LogMarshaler, LogStatelessMarshaler) already serialize both fields, so this aligns the console exporter with them.
• The two fields are independent: custom levels such as log4j's AUDIT cannot be recovered from the severity enum alone.
• Nothing is appended when the severity text is null or empty, so existing output is unchanged.
• Same shape as Output event name in SystemOutLogRecordExporter #8609 (event name), which fixed SystemOutLogRecordExporter does not output the log record event name #8608.

Testing done

• Added SystemOutLogRecordExporterTest#formatWithSeverityText asserting [severityText: SEVERE] in the formatted line; the existing format() test covers the unset case.
• ./gradlew :exporters:logging:check — 17 tests passed.
• No public API change, so no apidiff update.

[opentelemetry-pr-dashboard]

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Waiting on reviewers · refreshed 2026-08-10 01:36 UTC

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.65%. Comparing base (d948e13) to head (f65546a).

Files with missing lines	Patch %	Lines
...y/exporter/logging/SystemOutLogRecordExporter.java	66.66%	0 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (66.66%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8713      +/-   ##
============================================
- Coverage     91.65%   91.65%   -0.01%     
- Complexity    10352    10353       +1     
============================================
  Files          1003     1003              
  Lines         27210    27213       +3     
  Branches       3199     3200       +1     
============================================
+ Hits          24939    24941       +2     
  Misses         1566     1566              
- Partials        705      706       +1     

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