Ensure exported struct in sdk/log are not comparable

CHANGELOG.md

@@ -22,6 +22,8 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 - `Processor.OnEmit` in `go.opentelemetry.io/otel/sdk/log` now accepts a pointer to `Record` instead of a value so that the record modifications done in a processor are propagated to subsequent registered processors. (#5636)
 - `SimpleProcessor.Enabled` in `go.opentelemetry.io/otel/sdk/log` now returns `false` if the exporter is `nil`. (#5665)
+- The `SimpleProcessor` type in `go.opentelemetry.io/otel/sdk/log` is no longer comparable. (#5693)
+- The `BatchProcessor` type in `go.opentelemetry.io/otel/sdk/log` is no longer comparable. (#5693)
 
 ### Fixed
 

sdk/log/batch.go

@@ -96,6 +96,8 @@ type BatchProcessor struct {
 
 	// stopped holds the stopped state of the BatchProcessor.
 	stopped atomic.Bool
+
+	noCmp [0]func() //nolint: unused  // This is indeed used.
 }
 
 // NewBatchProcessor decorates the provided exporter

sdk/log/provider.go

@@ -69,6 +69,8 @@ type LoggerProvider struct {
 	loggers   map[instrumentation.Scope]*logger
 
 	stopped atomic.Bool
+
+	noCmp [0]func() //nolint: unused  // This is indeed used.
 }
 
 // Compile-time check LoggerProvider implements log.LoggerProvider.

sdk/log/record.go

@@ -86,6 +86,8 @@ type Record struct {
 
 	attributeValueLengthLimit int
 	attributeCountLimit       int
+
+	noCmp [0]func() //nolint: unused  // This is indeed used.
 }
 
 func (r *Record) addDropped(n int) {

sdk/log/simple.go

@@ -16,6 +16,8 @@ var _ Processor = (*SimpleProcessor)(nil)
 // Use [NewSimpleProcessor] to create a SimpleProcessor.
 type SimpleProcessor struct {
 	exporter Exporter
+
+	noCmp [0]func() //nolint: unused  // This is indeed used.
 }
 
 // NewSimpleProcessor is a simple Processor adapter.