Deprecate OpenCensus compatibility requirements#5138
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jack-berg merged 4 commits intoJun 12, 2026
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OpenCensus is no longer maintained (sunsetting blog post July 2023). Adoption numbers across language implementations are microscopic (JS: 31/week npm; Python: ~225/week PyPI; no .NET or Rust shim). This follows the same pattern as the OpenTracing deprecation in open-telemetry#4938: mark the status as Deprecated, add a NOTE block with the timeline (no earlier than June 2027), and preserve the existing content for migration guidance. Fixes open-telemetry#5109
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Should we also be adding a note to https://github.com/open-telemetry/opentelemetry-specification/blob/main/spec-compliance-matrix.md under the OpenCensus section? |
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Thanks @Krishnachaitanyakc! In continuation of following the pattern of the opentracing compatibility document, we should also publish a quick blog post to share the change more widely.
See:
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Thanks @jack-berg. I will open the follow-up blog PR after this merges |
maryliag
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I'll merge this on Friday 6/12 if there are no dissenting opinions. |
codeboten
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bogdandrutu
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arminru
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This was referenced Jun 12, 2026
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### Context - Clarify that environment variable propagation carriers normalize requested keys, carrier keys, and returned keys. ([open-telemetry#5102](open-telemetry#5102)) - Specify that environment variable propagation carriers only read and return normalized environment variable names. ([open-telemetry#5144](open-telemetry#5144)) - Specify that an empty environment variable propagation name is non-normalized and normalizes to `_`. ([open-telemetry#5163](open-telemetry#5163)) ### Profiles - Remove duplicate information from and extend Profiles documentation (README.md, pprof.md). ([open-telemetry#4932](open-telemetry#4932)) ### Entities - Add specification for communicating entity information as structured log events. ([open-telemetry#4836](open-telemetry#4836)) ### Common - Add an in-development [SDK self-observability](specification/self-observability.md) section, referenced from the Tracing, Metrics, and Logs SDK specs. ([open-telemetry#5087](open-telemetry#5087)) - Clarify non-OTLP representation guidance for nested `AnyValue` values in arrays and maps. ([open-telemetry#5053](open-telemetry#5053)) - Add in-development guidance recommending a JSON object as the string representation for an attribute in non-OTLP protocols. ([open-telemetry#5028](open-telemetry#5028)) - Add in-development guidance recommending a JSON object as the string representation for an attribute collection in non-OTLP protocols. ([open-telemetry#5110](open-telemetry#5110)) ### Compatibility - Deprecate OpenCensus compatibility requirements in the specification. ([open-telemetry#5138](open-telemetry#5138)) - Stabilize sections of Prometheus Metrics Exporter. - Clarify resource attributes configuration. ([open-telemetry#5084](open-telemetry#5084)) - Stabilize the conversion of OTLP Summaries into Prometheus Summaries. ([open-telemetry#5107](open-telemetry#5107)) - Stabilize client libs section. ([open-telemetry#5106](open-telemetry#5106)) - Stabilize Prometheus Metrics Exporter default aggregation configuration. ([open-telemetry#5113](open-telemetry#5113)) - Stabilize sections of Prometheus and OpenMetrics Compatibility. - Stabilize OpenTelemetry Histogram to Prometheus Histogram transformation. ([open-telemetry#5091](open-telemetry#5091)) - Add optional OpenTelemetry Histogram to Prometheus Native Histogram with Custom Buckets transformation. ([open-telemetry#5091](open-telemetry#5091)) ### SDK Configuration - Add link to declarative config IdGenerator type ([open-telemetry#5133](open-telemetry#5133)) ### OTEPs - Context-scoped Attributes. ([open-telemetry#4931](open-telemetry#4931)) --------- Co-authored-by: Reiley Yang <reyang@microsoft.com>
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Deprecate OpenCensus compatibility requirements, following the same pattern as the OpenTracing deprecation in #4938.
OpenCensus was sunset in July 2023. Adoption numbers are microscopic (JS: 31/week npm; Python: ~225/week PyPI; no .NET or Rust shim shipped). @jack-berg confirmed he is happy to sponsor.
Changes:
specification/compatibility/opencensus.md: status → Deprecated; added NOTE block with June 2027 removal timelineCHANGELOG.md: Unreleased → Compatibility entryFixes #5109