Symptoms
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The following message can be found in the PUM log at
/var/log/plesk/systemupdatestool.log:INFO: pum is called with arguments: ['--update', '--json', '--', 'grafana']
INFO: updating packages: grafana
warning: /var/cache/yum/x86_64/7/plesk-ext-grafana/packages/grafana-8.5.21-1.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID 2cf3c0c6: NOKEY
Importing GPG key 0x2CF3C0C6:
Userid : "Grafana Labs engineering@grafana.com"
Fingerprint: 0e22 eb88 e39e 1227 7a77 60ae 9e43 9b10 2cf3 c0c6
From : https://autoinstall.plesk.com/grafana/rpm/gpg.key
ERROR: Didn't install any keys
ERROR: Exited with returncode 1.:
Cause
A temporary issue with the GPG key of the Grafana package repository hosted by Plesk.
Resolution
Update Grafana package manually:
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Connect to the server via SSH;
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Execute the command:
# yum update grafana -y
In case the issue still persist:
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Reimport the key and reinstall the Grafana extension:
# rpm --import https://autoinstall.plesk.com/grafana/rpm/gpg.key
# plesk bin extension --install grafana