Hi Yunus, thanks for following up on my report.
{
"description": "Cassandra Cluster",
"layout": [],
"tags": [
"cassandra",
"metrics"
],
"title": "Cassandra",
the 'layout' field becomes an empty array when this issue happens. This happened just randomly when I just click and enter 'cassandra' dashboard. I even manually rebuilt a second cassandra dashboard by manually recreating each panel. After one day or two. Both dashboards become empty.