[processor/tailsampling] Add gated tail storage extension support#47331
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andrzej-stencel merged 8 commits intoApr 13, 2026
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Add an extension-backed tail storage path behind a feature gate while preserving in-memory default behavior and validating tail_storage config. Include processor/config tests and documentation for enabling the feature gate. Assisted-by: ChatGPT 5.3-codex Made-with: Cursor
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| // TailStorageID specifies an optional tail storage extension to use for buffering spans. | ||
| // If not set, in-memory tail storage is used. | ||
| // It is behind feature gate `processor.tailsamplingprocessor.tailstorageextension`. | ||
| TailStorageID *component.ID `mapstructure:"tail_storage"` |
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I think this should probably be Optional[component.ID]?
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Interestingly every component.ID in various config.go in contrib and collector repo seems to be using *component.ID, not configoptional.Optional[component.ID]. Upon further digging I found open-telemetry/opentelemetry-collector#13822 . Let's say when this is resolved, someone could clean up all the *component.ID usages once and for all?
Co-authored-by: Joshua MacDonald <jmacd@users.noreply.github.com>
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…en-telemetry#47331) #### Description Add a first-step tail storage extension integration for tailsampling so span buffering can be backed by an extension implementation. This keeps the current in-memory behavior as the default and gates extension-backed `tail_storage` configuration behind `processor.tailsamplingprocessor.tailstorageextension` while the interface is still evolving. There should be no behavior change introduced by this PR. #### Link to tracking issue Part of open-telemetry#42326 #### Testing - `make test` (in `processor/tailsamplingprocessor`) - `make lint` (in `processor/tailsamplingprocessor`) - `make chlog-validate` (repo root) - Added/updated unit tests for config validation and extension integration paths #### Documentation - Updated `processor/tailsamplingprocessor/README.md` with feature-gate requirements for `tail_storage` - Added `.chloggen/tailsamplingprocessor-tail-storage-extension.yaml` Made with [Cursor](https://cursor.com) --------- Co-authored-by: Joshua MacDonald <jmacd@users.noreply.github.com>
gracewehner
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Apr 29, 2026
…en-telemetry#47331) #### Description Add a first-step tail storage extension integration for tailsampling so span buffering can be backed by an extension implementation. This keeps the current in-memory behavior as the default and gates extension-backed `tail_storage` configuration behind `processor.tailsamplingprocessor.tailstorageextension` while the interface is still evolving. There should be no behavior change introduced by this PR. #### Link to tracking issue Part of open-telemetry#42326 #### Testing - `make test` (in `processor/tailsamplingprocessor`) - `make lint` (in `processor/tailsamplingprocessor`) - `make chlog-validate` (repo root) - Added/updated unit tests for config validation and extension integration paths #### Documentation - Updated `processor/tailsamplingprocessor/README.md` with feature-gate requirements for `tail_storage` - Added `.chloggen/tailsamplingprocessor-tail-storage-extension.yaml` Made with [Cursor](https://cursor.com) --------- Co-authored-by: Joshua MacDonald <jmacd@users.noreply.github.com>
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Description
Add a first-step tail storage extension integration for tailsampling so span buffering can be backed by an extension implementation.
This keeps the current in-memory behavior as the default and gates extension-backed
tail_storageconfiguration behindprocessor.tailsamplingprocessor.tailstorageextensionwhile the interface is still evolving.There should be no behavior change introduced by this PR.
Link to tracking issue
Part of #42326
Testing
make test(inprocessor/tailsamplingprocessor)make lint(inprocessor/tailsamplingprocessor)make chlog-validate(repo root)Documentation
processor/tailsamplingprocessor/README.mdwith feature-gate requirements fortail_storage.chloggen/tailsamplingprocessor-tail-storage-extension.yamlMade with Cursor