Override span fields | Respan Docs

By default, Respan captures span input and output from the function arguments and return value. When that isn’t what you want displayed in the trace UI — for example, you want to redact sensitive args, condense a large payload, or surface a different field — override the span at runtime via update_current_span().

Override input & output

Python

1 import json
2 from opentelemetry.semconv_ai import SpanAttributes
3 from respan import Respan
4 from respan.decorators import workflow
5 
6 respan = Respan()
7 client = respan.getClient()
8 
9 @workflow(name="update_attributes_test")
10 def update_attributes_test(input: str):
11     force_set_attributes = {
12         SpanAttributes.TRACELOOP_ENTITY_INPUT: json.dumps({
13             "args": [],
14             "kwargs": {"text": "custom input"}
15         }),
16     }
17 
18     client.update_current_span(
19         attributes=force_set_attributes,
20         name="update_attributes_test",
21         respan_params={"metadata": {"test": "test"}},
22     )
23 
24     return "Some desired output"
25 
26 if __name__ == "__main__":
27     update_attributes_test("Some input")

Use update_current_span(attributes=...) for overriding displayed input/output. Values must be JSON-serializable strings via json.dumps(...).

You can also update spans after they’ve been logged via the Update Span API.