v0.146.0

Images and binaries here: https://github.com/open-telemetry/opentelemetry-collector-releases/releases/tag/v0.146.0

End User Changelog

🛑 Breaking changes 🛑

• all: Increase minimum Go version to 1.25 (#14567)

🚩 Deprecations 🚩

• pdata/pprofile: Declare removed aggregation elements as deprecated. (#14528)

💡 Enhancements 💡

• all: Add detailed failure attributes to exporter send_failed metrics at detailed telemetry level. (#13956)
  The otelcol_exporter_send_failed_{spans,metric_points,log_records} metrics now include
  failure attributes when telemetry level is Detailed: error.type (OpenTelemetry semantic convention
  describing the error class) and error.permanent (indicates if error is permanent/non-retryable).
  The error.type attribute captures gRPC status codes (e.g., "Unavailable", "ResourceExhausted"),
  standard Go context errors (e.g., "canceled", "deadline_exceeded"),
  and collector-specific errors (e.g., "shutdown").
  This enables better alerting and debugging by providing standardized error classification.

• cmd/builder: Introduce new experimental init subcommand (#14530)
  The new init subcommand initializes a new custom collector

• cmd/builder: Add "telemetry" field to allow configuring telemetry providers (#14575)
  Most users should not need to use this, this field should only be set if you
  intend to provide your own OpenTelemetry SDK.

• cmd/mdatagen: Introduce additional metadata (the version since the deprecation started, and the deprecation reason) for deprecated metrics. (#14113)

• cmd/mdatagen: Add optional relationships field to entity schema in metadata.yaml (#14284)

• exporter/debug: Add output_paths configuration option to control output destination when use_internal_logger is false. (#10472)
  When use_internal_logger is set to false, the debug exporter now supports configuring the output destination via the output_paths option.
  This allows users to send debug exporter output to stdout, stderr, or a file path.
  The default value is ["stdout"] to maintain backward compatibility.

• pkg/confmap: Add experimental ToStringMapRaw function to decode confmap.Conf into a string map without losing internal types (#14480)
  This method exposes the internal structure of a confmap.Conf which may change at any time without prior notice

🧰 Bug fixes 🧰

• cmd/mdatagen: Reset aggDataPoints during metric init to avoid index out of range panic across emit cycles when reaggregation is enabled. (#14569)
• cmd/mdatagen: Fix panic when mdatagen is run without arguments. (#14506)
• pdata/pprofile: Fix off-by-one issue in dictionary lookups. (#14534)
• pkg/config/confighttp: Fix high cardinality span name from request method from confighttp server internal telemetry (#14516)
  Follow spec to bound request method cardinality.
• pkg/otelcol: Ignore component aliases in the otelcol components command (#14492)
• pkg/otelcol: Order providers and converters in alphabetical order in the components subcommand. (#14476)

API Changelog

🛑 Breaking changes 🛑

• cmd/mdatagen: Flatten the metric stability field (#14113)
  So we better match the weaver schema. Additional deprecation data can be set within the deprecated field.

🚩 Deprecations 🚩

• pdata/pprofile: Declare removed aggregation elements as deprecated. (#14528)

💡 Enhancements 💡

• cmd/mdatagen: Add entity association requirement for metrics and events when entities are defined (#14284)
• pkg/otelcol: Gate process signals behind build tags (#14542)
  Particularly for Wasm on JS, there are no invalid process signal references, which would cause build failures.