log: Make Record not comparable (#5847)

Fixes #5696

Author: pellared

CHANGELOG.md

@@ -13,6 +13,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Enable exemplars by default in `go.opentelemetry.io/otel/sdk/metric`. Exemplars can be disabled by setting `OTEL_METRICS_EXEMPLAR_FILTER=always_off` (#5778)
 - `Logger.Enabled` in `go.opentelemetry.io/otel/log` now accepts a newly introduced `EnabledParameters` type instead of `Record`. (#5791)
 - `FilterProcessor.Enabled` in `go.opentelemetry.io/otel/sdk/log/internal/x` now accepts `EnabledParameters` instead of `Record`. (#5791)
+- The `Record` type in `go.opentelemetry.io/otel/log` is no longer comparable. (#5847)
 
 ### Fixed
 

log/record.go

@@ -16,6 +16,9 @@ const attributesInlineCount = 5
 
 // Record represents a log record.
 type Record struct {
+	// Ensure forward compatibility by explicitly making this not comparable.
+	noCmp [0]func() //nolint: unused  // This is indeed used.
+
 	timestamp         time.Time
 	observedTimestamp time.Time
 	severity          Severity