[dashboard] Temporarily disable tensorboard (#8121)

python/ray/dashboard/client/src/pages/dashboard/tune/TuneTensorBoard.tsx

@@ -47,8 +47,8 @@ class TuneTensorBoard extends React.Component<
       <div className={classes.root}>
         {error === "TypeError: Failed to fetch" && (
           <Typography className={classes.warning} color="textSecondary">
-            Warning: Tensorboard server closed. View Tensorboard by running
-            "tensorboard --logdir" if not displaying below.
+            Warning: Tensorboard is currently not available. View Tensorboard
+            by running "tensorboard --logdir" if not displaying below.
           </Typography>
         )}
         <iframe

python/ray/dashboard/dashboard.py

@@ -1031,12 +1031,12 @@ class TuneCollector(threading.Thread):
             if len(df) == 0 or "trial_id" not in df.columns:
                 continue
 
-            # start TensorBoard server if not started yet
-            if not self._tensor_board_started:
-                tb = program.TensorBoard()
-                tb.configure(argv=[None, "--logdir", self._logdir])
-                tb.launch()
-                self._tensor_board_started = True
+            # # start TensorBoard server if not started yet
+            # if not self._tensor_board_started:
+            #     tb = program.TensorBoard()
+            #     tb.configure(argv=[None, "--logdir", self._logdir])
+            #     tb.launch()
+            #     self._tensor_board_started = True
 
             self._available = True