Sample
sdktrace.WithSpanLimits enforces asymmetric eviction between attributes and events/links, truncates span string attributes by rune count rather than byte length, and skips length truncation on event/link attributes
sha256:91f72226a7c13fff2aded4e72eca39849968343e26fc8a057a36bc1b05863023
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- go
- Operating system
- linux
- Architecture
- x64
- Runtime
- go
- Language
- go
- Package manager
- go
Verification-run environments
- Execution context
- go 1.26
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- go 1.26
- Language
- go
- Package manager
- go
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17
Case
- Goal
- sdktrace.WithSpanLimits enforces asymmetric eviction between attributes and events/links, truncates span string attributes by rune count rather than byte length, and skips length truncation on event/link attributes HOW
- Packages
-
go.opentelemetry.io/otel/sdk 1.35.0
- Environment
- go
- Created
- 2026-08-17T23:36:59Z
Commonly assumed
A model expects span limits to apply a uniform eviction strategy across all collections, truncate string attributes by byte count, and enforce AttributeValueLengthLimit across span, event, and link attributes identically.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- sdktrace.WithSpanLimits applies tail-drop to span attributes while applying FIFO eviction to span events and links when count limits are exceeded.
- Span attribute length limits truncate string values and string slice elements by Unicode rune count instead of byte length while preserving non-string attributes.
- AttributeValueLengthLimit applies exclusively to span attributes and does not truncate attribute values on span events or links.
- Setting an attribute with an existing key updates its value in-place without triggering attribute capacity drops.
- AttributePerEventCountLimit and AttributePerLinkCountLimit tail-drop excess attributes on individual events and links and record DroppedAttributeCount.
- Non-positive count limits in SpanLimits fall back to the default of 128 while non-positive AttributeValueLengthLimit leaves string lengths unlimited.
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- span_limits_test.go
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- go 1.26 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17 · ed25519:d91480838ac982c9