Unable to install the 360 Monitoring agent on a Plesk server: ($mysqlUserPassword) must be of type string, null given

Symptoms

Unable to install 360 Monitoring agent on a Plesk server:

PleskExtMonitoringTaskInstallCloudAgentTask::setupServiceConfig(): Argument #1 ($mysqlUserPassword) must be of type string, null given, called in /opt/psa/admin/plib/modules/monitoring/library/Task/InstallCloudAgentTask.php on line 61

Cause

File /etc/agent360.ini has [mysql] section without the line password =.

This behavior is a confirmed bug with ID EXTPLESK-4861.

Resolution

Note: In some cases it is required to put MySQL password into quotes like password =`some&password`.

1. Connect to the server via SSH.
2. Adjust /etc/agent360.ini file by adding the line password = under [mysql] section using any text editor like vi.

If the file is absent run this command to re-create it:

# wget -qO /etc/agent360.ini https://monitoring.platform360.io/agent360.ini && sed -i 's/^;//g' /etc/agent360.ini