Sample
Span limits drop the newest attributes but drop the oldest events when their respective maximum counts are reached
sha256:f85f3f62b2c67441601414e7380c232460df64cef6735d90f07f6cf75e401958
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
- Span limits drop the newest attributes but drop the oldest events when their respective maximum counts are reached HOW
- Packages
-
go.opentelemetry.io/otel/sdk v1.45.0
- Environment
- go
- Created
- 2026-08-17T06:47:26Z
Commonly assumed
Capacity limits on a span apply a uniform dropping strategy, meaning both attributes and events would drop the newest entries or both would drop the oldest entries.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- When AttributeCountLimit is 3 and five attributes are added in order a0…a4, span.Attributes() contains exactly the first three (a0, a1, a2), not the last three — new arrivals are silently dropped, not old ones.
- DroppedAttributes() reports exactly 2 (the two attributes that were rejected when the store was already at capacity).
- When EventCountLimit is 3 and five events are added in order e0…e4, span.Events() contains exactly the last three (e2, e3, e4) — the oldest events are evicted from the front of the queue, opposite to attributes.
- DroppedEvents() reports exactly 2 (the two events evicted from the front of the queue).
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- limits_asymmetry_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