Chain definitions have been included after the table.
        **ATTENTION** This reference table is for the V2 version of the schema.
        +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
        | event                | name             | chunk                           | input                                         | output                                          |
        +======================+==================+=================================+===============================================+=================================================+
        | on_chat_model_start  | [model name]     |                                 | {"messages": [[SystemMessage, HumanMessage]]} |                                                 |
        +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
        | on_chat_model_stream | [model name]     | AIMessageChunk(content="hello") |                                               |                                                 |
        +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
        | on_chat_model_end    | [model name]     |                                 | {"messages": [[SystemMessage, HumanMessage]]} | AIMessageChunk(content="hello world")           |
        +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
        | on_llm_start         | [model name]     |                                 | {'input': 'hello'}                            |                                                 |
        +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
        | on_llm_stream        | [model name]     | 'Hello'                         |                                               |                                                 |
        +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
        | on_llm_end           | [model name]     |                                 | 'Hello human!'                                |                                                 |
        +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
        | on_chain_start       | format_docs      |                                 |                                               |                                                 |
        +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+