Add a log in the default batch callback if uploading to FireTail fails

Author: TheTeaCat

logging/default_batch_callback.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"log"
 	"net/http"
 )
 
@@ -53,5 +54,8 @@ func getDefaultBatchCallback(options BatchLoggerOptions) func([][]byte) {
 				break
 			}
 		}
+		if err != nil {
+			log.Println("Error sending logs to Firetail API: ", err)
+		}
 	}
 }