Sample
TracerProvider defaults to ParentBased(AlwaysSample()) when WithSampler is unset, embedding specification sampler names AlwaysOnSampler and AlwaysOffSampler in its description
sha256:5f70d2ba9888e84e798c0e4450c4dc578490ff9c7590558fccf61ea53919fef3
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
- gomod
Verification-run environments
- Execution context
- go 1.26
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- go 1.26
- Language
- go
- Package manager
- gomod
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17
Case
- Goal
- TracerProvider defaults to ParentBased(AlwaysSample()) when WithSampler is unset, embedding specification sampler names AlwaysOnSampler and AlwaysOffSampler in its description HOW
- Packages
-
go.opentelemetry.io/otel/sdk v1.37.0
- Environment
- go
- Created
- 2026-08-17T06:41:52Z
Commonly assumed
AlwaysSample().Description() returns "AlwaysSample" and NeverSample().Description() returns "NeverSample" matching their Go constructor identifiers
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- AlwaysSample().Description() returns "AlwaysOnSampler" and NeverSample().Description() returns "AlwaysOffSampler" using OpenTelemetry specification names rather than Go constructor names
- ParentBased(AlwaysSample()).Description() composes the spec names into ParentBased{root:AlwaysOnSampler,remoteParentSampled:AlwaysOnSampler,remoteParentNotSampled:AlwaysOffSampler,localParentSampled:AlwaysOnSampler,localParentNotSampled:AlwaysOffSampler}
- NewTracerProvider() without WithSampler samples root spans by default
- NewTracerProvider() without WithSampler honors remote unsampled parent contexts by dropping child spans
- NewTracerProvider() without WithSampler honors remote sampled parent contexts by sampling child spans
Files
- NOTES.md
- csx.json
- defaultsampler_test.go
- go.mod
- go.sum
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