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Allow samplers to modify tracestate #988

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Sep 25, 2020
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Allow samplers to modify tracestate #988

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43bb201
Allow samplers to modify tracestate, fix #856
Sep 22, 2020
d4b80a6
changelog
Sep 22, 2020
d050af3
review: tracestate is associated with Span through the context
Sep 22, 2020
8e5bab6
Update sdk.md
Sep 24, 2020
e73146e
Merge branch 'master' into tracestateSampler
Sep 24, 2020
652a1c2
Update sdk.md
Sep 24, 2020
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -29,6 +29,8 @@ New:
* `exception.escaped` semantic span event attribute was added
([#784](https://github.com/open-telemetry/opentelemetry-specification/pull/784),
[#946](https://github.com/open-telemetry/opentelemetry-specification/pull/946))
- Allow samplers to modify tracestate
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Suggested change
- Allow samplers to modify tracestate
- Add (modified) Tracestate to the return value of Samplers

Otherwise it sounds like something optional but this actually changed the interface and SIGs will have to implement this.

([#856](https://github.com/open-telemetry/opentelemetry-specification/pull/988/))
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Suggested change
([#856](https://github.com/open-telemetry/opentelemetry-specification/pull/988/))
([#988](https://github.com/open-telemetry/opentelemetry-specification/pull/988/))


Updates:

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5 changes: 5 additions & 0 deletions specification/trace/sdk.md
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Expand Up @@ -99,6 +99,11 @@ It produces an output called `SamplingResult` which contains:
* `RECORD_AND_SAMPLE` - `IsRecording() == true` AND `Sampled` flag` MUST be set.
* A set of span Attributes that will also be added to the `Span`. The returned
object must be immutable (multiple calls may return different immutable objects).
* A `Tracestate` that will be associated with the `Span` through the new
`SpanContext`.
Note: If the sampler returns an empty `Tracestate` here, the `Tracestate` will be cleared,
so samplers should normally return the passed-in `Tracestate` if they do not intend
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Suggested change
so samplers should normally return the passed-in `Tracestate` if they do not intend
so samplers SHOULD return the `Tracestate` passed to them, if they do not intend

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@Oberon00 Oberon00 Sep 25, 2020 •
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In a Note, we should not have upper-case requirements. If you want reword it, also drop the "Note:", and probably make it a MUST

to change it.

#### GetDescription

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