@thomas-braun
Hallo,
ich habe exakt das gleiche Problem - nur mit der aktuellen Version 9.1.7.
Die 9.1.6 hat stabil funktioniert. Per update wurde die 9.1.7 aktualisiert.
In diesem Thread die Tipps leider erflglos versucht und schlussendlich die Holzhammermethode versucht: grafana deinstalliert und neu installiert.
Gleiches Ergebnis.
IOBroker und Rest des Raspi funktioniert einwandfrei - zum Glück.
Ich bin mit meinem kleinen Latinum am Ende 
Vielleicht hat jemand eine Idee?
pi@raspberrypi:~ $ systemctl status grafana-server
● grafana-server.service - Grafana instance
Loaded: loaded (/usr/lib/systemd/system/grafana-server.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2022-10-06 11:22:37 CEST; 6min ago
Docs: http://docs.grafana.org
Process: 11843 ExecStart=/usr/sbin/grafana-server --config=${CONF_FILE} --pidfile=${PID_FILE_DIR}/grafana-server.pid --packaging=deb cfg:default.paths.logs=${LOG_DIR} cfg:default.paths
Main PID: 11843 (code=exited, status=1/FAILURE)
Okt 06 11:22:37 raspberrypi systemd[1]: grafana-server.service: Failed with result 'exit-code'.
Okt 06 11:22:37 raspberrypi systemd[1]: grafana-server.service: Service hold-off time over, scheduling restart.
Okt 06 11:22:37 raspberrypi systemd[1]: Stopped Grafana instance.
Okt 06 11:22:37 raspberrypi systemd[1]: grafana-server.service: Start request repeated too quickly.
Okt 06 11:22:37 raspberrypi systemd[1]: Failed to start Grafana instance.
Okt 06 11:22:37 raspberrypi systemd[1]: grafana-server.service: Unit entered failed state.
Okt 06 11:22:37 raspberrypi systemd[1]: grafana-server.service: Failed with result 'exit-code'.
pi@raspberrypi:~ $ date && date -u
Do 6. Okt 11:34:57 CEST 2022
Do 6. Okt 09:34:57 UTC 2022
pi@raspberrypi:~ $ sudo systemctl restart grafana-server
pi@raspberrypi:~ $ systemctl status grafana-server
● grafana-server.service - Grafana instance
Loaded: loaded (/usr/lib/systemd/system/grafana-server.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2022-10-06 11:35:07 CEST; 1s ago
Docs: http://docs.grafana.org
Process: 12386 ExecStart=/usr/sbin/grafana-server --config=${CONF_FILE} --pidfile=${PID_FILE_DIR}/grafana-server.pid --packaging=deb cfg:default.paths.logs=${LOG_DIR} cfg:default.paths
Main PID: 12386 (code=exited, status=1/FAILURE)
Okt 06 11:35:07 raspberrypi systemd[1]: grafana-server.service: Unit entered failed state.
Okt 06 11:35:07 raspberrypi systemd[1]: grafana-server.service: Failed with result 'exit-code'.
Okt 06 11:35:07 raspberrypi systemd[1]: grafana-server.service: Service hold-off time over, scheduling restart.
Okt 06 11:35:07 raspberrypi systemd[1]: Stopped Grafana instance.
Okt 06 11:35:07 raspberrypi systemd[1]: grafana-server.service: Start request repeated too quickly.
Okt 06 11:35:07 raspberrypi systemd[1]: Failed to start Grafana instance.
Okt 06 11:35:07 raspberrypi systemd[1]: grafana-server.service: Unit entered failed state.
Okt 06 11:35:07 raspberrypi systemd[1]: grafana-server.service: Failed with result 'exit-code'.
Auch ein (erneutes) Installieren der 9.1.7 klappt nicht
sudo apt update
sudo systemctl stop grafana-server
sudo apt install --reinstall grafana
sudo systemctl restart grafana-server