fix: add warning for ENFORCE_INCLUDE_USAGE in stream mode

relay/adaptor/openai/adaptor.go

@@ -9,6 +9,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/pkg/errors"
 	"github.com/songquanpeng/one-api/common/config"
+	"github.com/songquanpeng/one-api/common/logger"
 	"github.com/songquanpeng/one-api/relay/adaptor"
 	"github.com/songquanpeng/one-api/relay/adaptor/doubao"
 	"github.com/songquanpeng/one-api/relay/adaptor/minimax"
@@ -77,6 +78,11 @@ func (a *Adaptor) ConvertRequest(c *gin.Context, relayMode int, request *model.G
 		return nil, errors.New("request is nil")
 	}
 
+	if request.Stream && !config.EnforceIncludeUsage {
+		logger.Warn(c.Request.Context(),
+			"please set ENFORCE_INCLUDE_USAGE=true to ensure accurate billing in stream mode")
+	}
+
 	if config.EnforceIncludeUsage && request.Stream {
 		// always return usage in stream mode
 		if request.StreamOptions == nil {