Perses is an excellent step towards vendor neutrality. We at Dash0 are basing our dashboarding data model entirely on Perses to allow you to bring/take away as much of your configuration as possible.
The team around Perses did a solid job coming up with the data model and making it look very Kubernetes manifest-like. This makes for good consistency, especially when configuring via Kubernetes CRs.
Didn't know about Perses. Looks promising! I've had one foot out the door with Grafana for a couple years -- always felt heavy and not-quite-there (especially the Loki log explorer), and IMHO they made alerts far less usable with the redesign in version 8.
Less mature than Grafana but recently accepted by the CNCF as a sandbox project, hopefully a positive leading indicator of success.