[O11y][Spring Boot] Lens Migration

[rajvi-patel-22]

Manually migrate Spring Boot visualizations to lens in current Kibana version 8.1.0 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

Spring Boot Dashboards	Before Migration		After Migration
	Lens	Visualization	Lens	Visualization
[Spring Boot] Audit Events	2	0	2	0
[Spring Boot] Overview Dashboard	6	3	9	0
[Spring Boot] Access logs	2	0	2	0
[Spring Boot] Memory and Threads	5	0	5	0
	15	3	18	0

Data stream : HTTP Trace

• Migrate 2 visualizations to the lens.
  • [O11y][Spring Boot] Lens migration for visualizations to Kibana version 8.1.0 #5530

Data stream : Threading

• Migrate 1 visualization to the lens.
  • [O11y][Spring Boot] Lens migration for visualizations to Kibana version 8.1.0 #5530

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 (8.1.0)

[rajvi-patel-22]

PR is approved and merged, hence closing this issue. #5530