haystack

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---
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enhancements:
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  - |
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    Allow code instrumentation to also trace the input and output of components.
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    This is useful for debugging and understanding the behavior of components.
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    This behavior is disabled by default and can be enabled with one of the following methods:
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    - Set the environment variable `HAYSTACK_CONTENT_TRACING_ENABLED_ENV_VAR` to `true` before importing Haystack.
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    - Enable content tracing in the code:
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        ```python
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        from haystack import tracing
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        tracing.tracer.is_content_tracing_enabled = True
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        ```
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