I'm actually surprised by how well received Valkey is right now, given that they forked not too long ago. Below are GitHub engagement insights for the two projects:

https://devboard.gitsense.com/redis?id=f66d8a46ef&nb=all

For a longer case study, you might be interested in Elastic and OpenSearch

https://devboard.gitsense.com/opensearch-project?id=e766e581...

Both projects are quite healthy, but Elastic is still clearly more popular.