Adding thinkingpart to otel_events in ModelResponse

[adtyavrdhn]

Closes #2131

Moves from each TextPart being its own event to clubbing all TextParts and ThinkingPart events into one body

Updates the tests based on this new approach

[adtyavrdhn]

I am not too pleased with : 'kind': 'text', 'text': part.content

[alexmojaki]

only if there's multiple parts. it's the same in ModelRequests, right?

[adtyavrdhn]

No, In ModelRequests each part again gets its own Event

pydantic-ai/tests/models/test_instrumented.py

Lines 587 to 623 in 490c3b4

	'role': 'system',
	'gen_ai.message.index': 0,
	'gen_ai.system': 'my_system',
	},
	{
	'event.name': 'gen_ai.user.message',
	'content': 'user_prompt',
	'role': 'user',
	'gen_ai.message.index': 0,
	'gen_ai.system': 'my_system',
	},
	{
	'event.name': 'gen_ai.tool.message',
	'content': 'tool_return_content',
	'role': 'tool',
	'name': 'tool3',
	'id': 'tool_call_3',
	'gen_ai.message.index': 0,
	'gen_ai.system': 'my_system',
	},
	{
	'event.name': 'gen_ai.tool.message',
	'content': """\
	retry_prompt1
	Fix the errors and try again.\
	""",
	'role': 'tool',
	'name': 'tool4',
	'id': 'tool_call_4',
	'gen_ai.message.index': 0,
	'gen_ai.system': 'my_system',
	},
	{
	'event.name': 'gen_ai.user.message',
	'content': """\
	Validation feedback:

[adtyavrdhn]

We display {'kind' : 'text'} in ModelRequest when include_content is disabled, otherwise just content

[alexmojaki]

ah, I'm thinking of UserPromptPart.

anyway, forget analogies. if there's one part, don't change behaviour.

[alexmojaki]

ok, if there's just one TextPart then

[adtyavrdhn]

We could do this, if it is ThinkingPart, even if it is just one then we add kind. If it is just one TextPart then we don't and let it be derived that it's just text response. If there are multiple then we club these together like we are doing currently in the PR.

[alexmojaki]

right, but it should either be a string or a list of one or more dicts, not a single dict.

[adtyavrdhn]

A single dict not even for a single ThinkingPart? What would be the ideal way to represent a single ThinkingPart?

[alexmojaki]

i don't think that should actually happen. but yes, even then, a list with a single dict. same for excluded content with a single text part.

[adtyavrdhn]

@alexmojaki

I've clubbed the events together keeping only ToolCallPart separate.