Describe the bug
I am using a combination of:
go.elastic.co/apm v1.15.0
go.elastic.co/apm/module/apmgin/v2 v2.6.0
go.elastic.co/apm/module/apmsql/v2 v2.6.0

apmgin and apmsql work

To Reproduce
Steps to reproduce the behavior:

gin middleware setting

engine := gin.New()
engine.Use(apmgin.Middleware(engine), middleware.Logger())

I try to get TraceID in middleware.Logger(),
Elastic Docs module/apmgin say [ For each request, a transaction is stored in the request context, which can be obtained via gin.Context.Request.Context() in your handler. ]

so in middleware.Logger()

var traceID string
tx := apm.TransactionFromContext(context.Request.Context())
if tx != nil {
    traceID = tx.TraceContext().Trace.String()
}

logger.Info( "request",
    zap.String("traceID", traceID),
    .... other field
)

tx always nil, so traceID always ""

Expected behavior
get the traceID