How to restore existing prometheus data on new kube-prometheus setup.

[shubhadaR]

Hello Team, I am trying to restore existing prometheus data on new kube-prometheus setup as i want to uninstall existing kube-prometheus-stack and reinstall it again to upgrade its version.
I need complete existing prometheus data to be restored on new kube-prometheus setup after reinstallation.

Tried solution:

1. Took snapshot on existing prometheus server using command
   curl -XPOST http://localhost:9090/api/v1/admin/tsdb/snapshot
   and then claim it on new kube-prometheus setup.
   I could restored data on new setup but it was only around 10 days old data.

Please let me know if i can improve in given solution or try some other ways to resolve it.