[SDK] Implement EnvEntityDetector for OTEL_ENTITIES parsing (#3652) #3795
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## main #3795 +/- ##
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+ Coverage 89.93% 90.08% +0.16%
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…emetry#3652) Changes: Add EnvEntityDetector class to parse OTEL_ENTITIES environment variable Parse entity format: type{id_attrs}[desc_attrs]@schema_url Support percent-encoding for reserved characters Handle duplicate entities, conflicting attributes, and malformed input per spec Include comprehensive test coverage Fix schema URL handling to pass to Resource Details: EnvEntityDetector::Detect() reads OTEL_ENTITIES and returns Resource with parsed attributes ParseEntities() splits input by semicolons and parses each entity definition ParseSingleEntity() extracts type, id_attrs, desc_attrs, and schema_url from entity string ParseKeyValueList() parses comma-separated key=value pairs PercentDecode() decodes percent-encoded values BuildEntityIdentityKey() creates stable key for duplicate detection Error handling: malformed entities skipped, duplicates use last occurrence, conflicts log warnings Implements entity propagation spec: https://opentelemetry.io/docs/specs/otel/entities/entity-propagation
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marcalff
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LGTM, thanks for the contribution
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Related #3652
Changes:
Details:
EnvEntityDetector::Detect()reads OTEL_ENTITIES and returns Resource with parsed attributesParseEntities()splits input by semicolons and parses each entity definitionParseSingleEntity()extracts type, id_attrs, desc_attrs, and schema_url from entity stringParseKeyValueList()parses comma-separated key=value pairsPercentDecode()decodes percent-encoded valuesBuildEntityIdentityKey()creates stable key for duplicate detectionError handlingmalformed entities skipped, duplicates use last occurrence, conflicts log warningsImplements entity propagation spec:
https://opentelemetry.io/docs/specs/otel/entities/entity-propagation/