Hi,
We are using temporal version 1.18.4.
What are the major features added in temporal latest version after 1.18.4?
Can we upgrade temporal to 1.21.5 directly?
Also, any changes to temporal UI version (using 2.8.1)?
What are the major features added in temporal latest version after 1.18.4?
You can follow release notes (highlights) since that release: Releases · temporalio/temporal · GitHub
Can we upgrade temporal to 1.21.5 directly?
No, docs upgrade process: Self-hosted Temporal Cluster guide | Temporal Documentation
Also, any changes to temporal UI version (using 2.8.1)?
Yes, similarly to service you can follow release notes: Releases · temporalio/ui · GitHub