RUM JavaScript API - 1.345.1
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    Variable CHARACTERISTIC_CONSTRAINED_ADDABLE_FIELD_KEYSConst

    CHARACTERISTIC_CONSTRAINED_ADDABLE_FIELD_KEYS: readonly [
        readonly [TRACE$ID, CHARACTERISTICS$HAS_REQUEST],
        readonly [SPAN$ID, CHARACTERISTICS$HAS_REQUEST],
    ] = ...

    Fields that may be ADDED via dynatrace.addEventModifier only when the target event carries the mapped characteristic. Each tuple is [fieldKey, requiredCharacteristicKey].