Tools & Settings > Advisor > Performance shows that HTTP/2 is disabled after upgrading to Plesk Obsidian:
CONFIG_TEXT: HTTP/2 is not configured
HTTP/2is shown as enabled via CLI:
# plesk bin http2_pref --status
- #EXTADVISOR-752 "The Advisor extension no longer shows that HTTP/2 is disabled on the server when it is, in fact, enabled."
- Advisor 1.7.2 31 October 2019
If update is not possible for some reason you may try the following
This is a cosmetic bug and can be safely ignored.