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Releases

AI-analyzed release notes for CNCF graduated and incubating projects.

May 2026Clear ×Project: OpenTelemetryClear ×
OpenTelemetryv0.153.0ObservabilityMay 25, 2026

This release updates configuration and metadata handling, with new schema and configuration capabilities and several API and feature-gate maturity changes. It also fixes Snappy memory corruption and fatal errors.

Check if affected (3)

  • breakingThe pdata.useCustomProtoEncoding feature gate, removed

    Applies if you use pdata.useCustomProtoEncoding.

    The pdata.useCustomProtoEncoding feature gate is removed from pkg/pdata.

  • breakingDefault reaggregation_enabled behavior

    Applies if you run cmd/mdatagen.

    cmd/mdatagen now enables reaggregation config generation by default. Set reaggregation_enabled: false to keep generating metric config with only the enabled field.

  • breakingStricter feature_gates validation

    Applies if you configure feature_gates in metadata.yaml.

    cmd/mdatagen now enforces stricter feature_gates validation in metadata.yaml by default. Strict validation can be skipped for an individual gate by setting skip_strict_validation: true on its gate entry.

Source
OpenTelemetryv0.152.1ObservabilityMay 19, 2026

A maintenance release that adds exporter in-flight request monitoring and configuration-validation APIs while correcting runtime and configuration behavior. It also changes Prometheus telemetry defaults for explicitly configured metrics and deprecates older validation APIs.

Check if affected (2)

  • breakingThe max_request_body_size limit for snappy requests

    Applies if you configure max_request_body_size.

    pkg/confighttp now enforces max_request_body_size on requests with Content-Encoding: snappy before allocating the decoded buffer.

  • breakingPrometheus exporter defaults for explicitly configured telemetry

    Applies if you configure the telemetry metrics section.

    pkg/service now applies the correct Prometheus exporter defaults during configuration unmarshaling when the telemetry metrics section is explicitly configured. WithoutScopeInfo, WithoutUnits, and WithoutTypeSuffix default to true instead of nil or false.

Plan ahead (1)

  • deprecatedThe xconfmap.Validator and confmap.Validate APIs

    Applies if you use xconfmap.Validator or confmap.Validate.

    pkg/xconfmap deprecates xconfmap.Validator and confmap.Validate in favor of confmap.Validator and confmap.Validate.

Source
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