opentelemetry-collector

Images and binaries here: https://github.com/open-telemetry/opentelemetry-collector-releases/releases/tag/v0.156.0

End User Changelog

💡 Enhancements 💡

• cmd/mdatagen: Add support for defining stability levels for resource attributes (#15312)
• cmd/mdatagen: Add semantic convention reference to resource attributes (#15313)
• processor/memory_limiter: Adding health events for the memorylimiter (#14700)
  Publish health event from memorylimiter using componentstatus.ReportStatus

🧰 Bug fixes 🧰

• cmd/mdatagen: Removes the extra line in the documentation.md between extended description and table (#15458)

• exporter/otlp_http: Treat errors parsing successful (2xx) HTTP response bodies as permanent errors to prevent retrying already-accepted data. (#15386)
  When a server returns a 2xx status but the response body exceeds the 64kB read limit,
  the body is truncated and proto unmarshaling fails. Previously this was treated as a
  retryable error, causing duplicate data to be exported. Now it is marked as a permanent
  error so the retry logic will not re-send data that was already accepted by the server.

• pkg/config/configretry: Always validate BackOffConfig fields regardless of the Enabled flag. (#15437)

• pkg/service: Ensure receivers always start after all other components (#15495)
  There was previously a race condition where multiple receivers using a shared internal implementation,
  such as the OTLP receiver, could start sending telemetry into a pipeline before all its components had fully started.

• processor/memory_limiter: Fix degenerate collector performance when exporter has problems causing permanent CPU-burning GC loop (#4981)
  Forced GC runs now use exponential backoff when deemed ineffective
  (still above soft limit and less than 5% reclaimed) to avoid preventing
  recovery by overloading CPU with excessive GC runs. The cap on the
  backoff interval is exposed via max_gc_interval_when_soft_limited and
  max_gc_interval_when_hard_limited (both default 30s); set either to
  0 to disable backoff on that path.

• provider/env: Fix empty env var default resolving to nil instead of empty string (#14587)
  When using ${env:VAR:-} with an unset variable, the empty default now correctly
  resolves to an empty string instead of nil.

API Changelog

🛑 Breaking changes 🛑

• pkg/pprofile: add bounds checks to FromAttributeIndices (#15517)

💡 Enhancements 💡

• cmd/mdatagen: Add field_name field to go_struct config in metadata.yaml to allow customizing the Go struct field name for generated config properties. (#15486)
• cmd/mdatagen: Handle enum validators in generated config structs (#14805)
  Supported validators include enum.
• cmd/mdatagen: Generate named Go types for primitive exported config schemas. (#15487)
  Primitive exported configs for string, integer, number, and boolean schemas now produce distinct exported types while default values and validation remain on referencing fields.

🧰 Bug fixes 🧰

• pkg/pprofile: fix wrong error sentinel in SetString (#15511)