Update dashboard.json

Signed-off-by: mohammedabdulwahhab <furkhan324@berkeley.edu>

Author: mohammedabdulwahhab

deploy/logging/grafana/dashboard.json

@@ -108,7 +108,7 @@
           "options": [],
           "query": "label_values(namespace)",
           "refresh": 1,
-          "regex": "",
+          "regex": ".+",
           "skipUrlSync": false,
           "sort": 1,
           "type": "query"