otellogr: Fix nil context panic

CHANGELOG.md

@@ -8,6 +8,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Fixed
+
+- Use `context.Background()` as default context instead of nil in `go.opentelemetry.io/contrib/bridges/otellogr`. (#6527)
+
 <!-- Released section -->
 <!-- Don't change this section unless doing release -->
 

bridges/otellogr/logsink.go

@@ -176,6 +176,7 @@ func NewLogSink(name string, options ...Option) *LogSink {
 		logger:        c.provider.Logger(name, opts...),
 		levelSeverity: c.levelSeverity,
 		opts:          opts,
+		ctx:           context.Background(),
 	}
 }
 
@@ -240,7 +241,7 @@ func (l *LogSink) Info(level int, msg string, keysAndValues ...any) {
 
 // Init receives optional information about the logr library this
 // implementation does not use it.
-func (l *LogSink) Init(info logr.RuntimeInfo) {
+func (l *LogSink) Init(logr.RuntimeInfo) {
 	// We don't need to do anything here.
 	// CallDepth is used to calculate the caller's PC.
 	// PC is dropped as part of the conversion to the OpenTelemetry log.Record.

bridges/otellogr/logsink_test.go

@@ -352,6 +352,40 @@ func TestLogSink(t *testing.T) {
 	}
 }
 
+// fix https://github.com/open-telemetry/opentelemetry-go-contrib/issues/6509
+func TestLogSinkCtxInInfo(t *testing.T) {
+	rec := logtest.NewRecorder()
+	ls := NewLogSink("name", WithLoggerProvider(rec))
+	l := logr.New(ls)
+	ctx := context.WithValue(context.Background(), "key", "value") // nolint:revive,staticcheck
+
+	tests := []struct {
+		name        string
+		keyValues   []any
+		wantCtxFunc func(ctx context.Context)
+	}{
+		{"default", nil, func(ctx context.Context) {
+			assert.Equal(t, context.Background(), ctx)
+		}},
+		{"default with context", []any{"ctx", ctx}, func(ctx context.Context) {
+			assert.Equal(t, "value", ctx.Value("key"))
+		}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			defer rec.Reset()
+
+			l.Info("msg", tt.keyValues...)
+			require.Len(t, rec.Result(), 1)
+
+			got := rec.Result()[0]
+			require.Len(t, got.Records, 1)
+			tt.wantCtxFunc(got.Records[0].Context())
+		})
+	}
+}
+
 func TestLogSinkEnabled(t *testing.T) {
 	enabledFunc := func(ctx context.Context, param log.EnabledParameters) bool {
 		return param.Severity == log.SeverityInfo