OTel SDK casts all span data values to string

[gggritso]

Summary

Something in the interaction between Go and OTel is casting all span data values to strings, even well-known measurement fields like http.response_content_length

Steps To Reproduce

I found this data in the wild, so I don't have actual repro steps, sorry! I can provide more details if you contact me on Slack

Expected Behavior

data.http.response_content_length is an integer

Screenshots

Environment

SDK

• sentry-go version: 0.25.0
• opentelemetry version: 1.18.0

Sentry

• Using hosted Sentry in sentry.io? yes

[AbhiPrasad]

We are using https://pkg.go.dev/go.opentelemetry.io/[email protected]/attribute#Value.Emit - this forces everything to be strings

sentry-go/otel/span_processor.go

Line 129 in fff66d1

attributes[kv.Key] = kv.Value.Emit()

.

We should remove the casting.

See https://opentelemetry.io/docs/concepts/signals/traces/#attributes

Values must be a non-null string, boolean, floating point value, integer, or an array of these values

[AbhiPrasad]

cc @cleptric