Grafana does not work: login.OAuthLogin(missing saved state)

Symptoms

• Grafana graphs are not shown:

203.113.0.2 redirected you too many times

OR

login.OAuthLogin(missing saved state)

• Plesk is installed on AlmaLinux 9 server
• The following errors occur in Grafana log /var/log/grafana/grafana.log

logger=context traceID=00000000000000000000000000000000 userId=0 orgId=0 uname= t=2023-07-13T10:38:54.40646435+02:00 level=error msg="Request Completed" method=GET path=/login/generic_oauth status=500 remote_addr=127.0.0.1 time_ms=0 duration=490.443µs size=1388 referer="https://203.113.0.2:8443/modules/monitoring/index.php/index/main?context=extNavButton_monitoring_1" traceID=00000000000000000000000000000000
logger=context traceID=00000000000000000000000000000000 userId=0 orgId=0 uname= t=2023-07-13T10:38:54.527613555+02:00 level=error msg="Request Completed" method=GET path=/login/generic_oauth status=500 remote_addr=127.0.0.1 time_ms=0 duration=743.878µs size=1388 referer="https://203.113.0.2:8443/modules/monitoring/index.php/index/main?context=extNavButton_monitoring_1" traceID=00000000000000000000000000000000
logger=context traceID=00000000000000000000000000000000 userId=0 orgId=0 uname= t=2023-07-13T10:49:29.26752975+02:00 level=error msg="user already exists"
logger=context traceID=00000000000000000000000000000000 userId=0 orgId=0 uname= t=2023-07-13T10:49:30.229244061+02:00 level=error msg="user already exists"

• The TOO_MANY_REDIRECTS error appears in the browser when the Grafana application is opened from Plesk > Extensions > Graphana > Open Application

Cause

Plesk bug #EXTPLESK-4838 - Unsupported version of Grafana installed on AlmaLinux 9

Resolution

As a workaround, perform the following steps:

1. Log in to the server via SSH.

2. Open /etc/yum.repos.d/almalinux-appstream.repo with any text editor and add the exclude=grafana line under the [appstream] block:

   [appstream]
   ...
   exclude=grafana

3. Remove the Grafana Extension:

   # plesk bin extension -u grafana
   The extension was successfully removed.

4. Remove the grafana package:

   # yum remove grafana -y
   Dependencies resolved.
   ...
   Complete!

5. Install the Grafana Extension:

   # plesk bin extension -i grafana