feat: Better debugging for console

server/internal/api/console.go

@@ -3,6 +3,7 @@ package api
 import (
 	"errors"
 	"fmt"
+	"log"
 	"net"
 	"net/http"
 	"os"
@@ -147,6 +148,12 @@ func consoleTunnel(c *gin.Context) {
 			c.JSON(http.StatusConflict, gin.H{"error": "agent_offline"})
 			return
 		}
+		// Logged as well as answered. The client is deliberately told nothing
+		// specific, but this is the only place the real reason exists — a
+		// failed dispatch and a relay that was never announced are the same
+		// generic 500 to the browser, and guacamole then reports the missing
+		// upgrade as an upstream error, which points at the wrong hop entirely.
+		log.Printf("console: open relay for server %s: %v", srv.ServerID, err)
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "could not open relay"})
 		return
 	}