Manually migrate Cassandra visualizations to lens in current Kibana version 8.3.0 itself.

Preparation of data for testing

• Use sample_event.json / setup live instance using docker / mock data using mock server to populate dashboards

Migration stats

Notes:

• 2 visualizations are migrated to new control panels.
• 2 visualizations are markdown which can not be migrated to the lens.

Data stream: Metrics

• Migrate 17 visualizations to the lens and 1 visualization to new control panel.
  • [O11y][Cassandra] Migrate Overview dashboard visualizations to lens in kibana 8.3.0  #5714

Data stream: Log

• Migrate 1 visualization to the lens and 1 visualization to new control panel.
  • [O11y][Cassandra] Migrate System Log dashboard visualizations to lens in kibana 8.3.0 #5715

Verification and Validation

• Verification of functionality remains the same after migration in Kibana
• Verification of data count of after-migrated visualization with before-migrated visualization in Kibana
• Verification of Dashboard are not distorted in supported Kibana version (8.3.0)

Issues Identified

• Visualizations with multiple breakdowns could not be migrated to lens
  [Cassandra] Visualizations with multiple breakdowns could not be migrated to lens #5531
  Impact : [ Severity : Critical, Workaround : Yes (Use multiple breakdown in lens)]