OpenTelemetry Collector 0.140.0 release notes

cmd/mdatagen: metadata.yaml now supports an optional entities section to organize resource attributes into logical entities with identity and description attributes (#14051) When entities are defined, mdatagen generates AssociateWith{EntityType}() methods on ResourceBuilder that associate resources with entity types using the entity refs API. The entities section is backward compatible - existing metadata.yaml files without entities continue to work as before.
cmd/mdatagen: Add semconv reference for metrics (#13920)
connector/forward: Add support for Profiles to Profiles (#14092)
exporter/debug: Disable sending queue by default (#14138) The recently added sending queue configuration in Debug exporter was enabled by default and had a problematic default size of 1. This change disables the sending queue by default. Users can enable and configure the sending queue if needed.
pkg/config/configoptional: Mark configoptional.AddEnabledField as beta (#14021)
pkg/otelcol: This feature has been improved and tested; secure-by-default redacts configopaque values (#12369)

all: Ensure service service.instance.id is the same for all the signals when it is autogenerated. (#14140)

pdata/pprofile: Upgrade the OTLP protobuf definitions to version 1.9.0 (#14128)
- Drop field CommentStrindices in Profile.
- Rename Sample to Samples in Profile.
- Rename Line to Lines in Location.
- Remove AggregationTemporality field in ValueType.
See https://github.com/open-telemetry/opentelemetry-proto/releases/tag/v1.9.0
pkg/otelcol: The otelcol.Factories.Telemetry field is now required (#14003) Previously if this field was not set, then it would default to an otelconftelemetry factory. Callers of the otelcol package must now set the field explicitly.