Add rolldice reference application (FastAPI)#5244
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Implements the OpenTelemetry reference application specification [1] with both uninstrumented and instrumented versions of a FastAPI dice-rolling service. The instrumented version uses declarative (file-based) YAML configuration for the telemetry pipeline with OTLP HTTP and console exporters for all three signal types (traces, metrics, logs). [1] https://opentelemetry.io/docs/getting-started/reference-application-specification/ Assisted-by: Claude Opus 4.6
Add OS resource detector, OTEL_LOG_LEVEL diagnostic verbosity control, dynamic OTEL_SERVICE_NAME support via env var substitution, and a CI workflow that smoke-tests both the instrumented and uninstrumented variants of the rolldice application. Co-Authored-By: Claude Opus 4.6 (1M context)
Update all license headers to the SPDX two-line format, fix import sorting and formatting per ruff, and add a towncrier changelog fragment.
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Description
Implements the OpenTelemetry reference application specification [1] with both uninstrumented and instrumented versions of a FastAPI dice-rolling service. The instrumented version uses declarative (file-based) YAML configuration for the telemetry pipeline with OTLP HTTP and console exporters for all three signal types (traces, metrics, logs).
[1] https://opentelemetry.io/docs/getting-started/reference-application-specification/
Fixes # #5167
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